Нужно вставить данные слова в пропуски: motorcycles • spark plugs • valves • burns • intermittent • reciprocating • polluting • runs • light • size • rotary • cycle • rockets
The spark-ignition two-stroke engine is an internal combustion (a) …………… motor, usually employed for chainsaws, (b) or boats. Relatively small and (c) ……… , it uses two strokes for every power (d) ………… and does not employ intake and exhaust (e) ………… but ports: special holes cut into the cylinder wall. It is quite powerful for its (f) ………… but tends to heat up and has a short life; besides, it (g)………… a lot of gasoline and oil, thus being very (h) ………… . Diesel engines are internal combustion reciprocating engines which do not rely on (i) ………… to cause combustion but exploit compressed air and spontaneous ignition of injected fuel. Gas engines are similar to gasoline ones but employ natural gas instead of gasoline vapour.
The Wankel engine (j) ………… on a four-stroke cycle but is a (k) ………… engine since the crank mechanism is replaced by a rotor. The reaction engine used for jets and (l) ………… and the gas turbine are not reciprocating, in fact combustion is not (m) ………… but continuous.

(a) The spark-ignition two-stroke engine is an internal combustion RECIPROCATING motor, usually employed for chainsaws, MOTORCYCLES or boats.

- An internal combustion engine is an engine that operates by burning fuel inside a combustion chamber. In this case, we are specifically talking about the spark-ignition two-stroke engine, which is commonly used in chainsaws, motorcycles, and boats.

- The term "reciprocating" means moving back and forth in a straight line. In the context of an engine, it refers to the up-and-down movement of the piston within the cylinder.

(b) Relatively small and LIGHT, it uses two strokes for every power CYCLE and does not employ intake and exhaust VALVES but ports: special holes cut into the cylinder wall.

- The engine is described as being relatively small and light, which means it is compact and not very heavy.

- It uses a two-stroke cycle, which means it completes a power cycle in two strokes of the piston (one up and one down) as opposed to the four strokes used in a four-stroke engine.

- Instead of using intake and exhaust valves like a four-stroke engine, it has ports, which are special holes cut into the cylinder wall that control the flow of air and fuel in and out of the combustion chamber.

(c) It is quite powerful for its SIZE but tends to heat up and has a short life; besides, it BURNS a lot of gasoline and oil, thus being very POLLUTING.

- The engine is described as being quite powerful considering its size, which means it produces a significant amount of power relative to its small physical dimensions.

- However, it has some drawbacks. It tends to heat up quickly, which can reduce its lifespan. Additionally, it consumes a lot of gasoline and oil, resulting in high pollution levels.

(d) Diesel engines are internal combustion RECIPROCATING engines which do not rely on SPARK PLUGS to cause combustion but exploit compressed air and spontaneous ignition of injected fuel.

- Diesel engines are also internal combustion engines, similar to the spark-ignition two-stroke engine. However, they use a different method of combustion. Instead of relying on spark plugs to ignite the fuel-air mixture, diesel engines use compressed air and the heat generated by the compressed air to spontaneously ignite the injected fuel.

(e) Gas engines are similar to gasoline ones but employ natural gas instead of gasoline vapour.

- Gas engines are another type of internal combustion engine, similar to the spark-ignition two-stroke engine. However, instead of using gasoline vapor as fuel, they use natural gas.

(f) The Wankel engine RUNS on a four-stroke CYCLE but is a ROTARY engine since the crank mechanism is replaced by a rotor.

- The Wankel engine is a type of internal combustion engine that operates on a four-stroke cycle, which means it completes a power cycle in four strokes of the piston (two up and two down).

- However, it is different from the reciprocating engine because it is a rotary engine. Instead of using a crankshaft mechanism to convert linear motion into rotational motion, it uses a rotor that rotates around an eccentric shaft.

(g) The reaction engine used for jets and ROCKETS and the gas turbine are not reciprocating, in fact combustion is not INTERMITTENT but continuous.

- Engines used for jets and rockets, as well as gas turbines, are not reciprocating engines.

- Unlike internal combustion reciprocating engines, which have intermittent combustion (combustion occurs at specific times during the cycle), these engines have continuous combustion, meaning that combustion is happening constantly while the engine is running.