help,交功課的!!我想問diesel engine係點運作架，最好係中英，一係就英文，5要全部中文

There are several steps for diesel engine to work.
(1)This is the first step called intake stroke. During this step the inlet valve open so that the diesel in gaseous form is put into the diesel engine.
(2)This is the second step called compression stroke. During this process, the piston located in diesel engine will carry out compression so that the diesel gas is compressed to the ratio of 1:8 during compression stroke.
(3)This is the third step called power stroke. During this process, a electric spark is given to the diesel gas so that diesel gas is burned. During this process, the burned gas expands rapidly, making the flywheel to rotate. The rotation of flywheel stores energy and transmits it to the wheels of the car so that the wheels of the car rotate and make the car move forwards.
(4)This is the final step called exhaust strokes, the exhaust valve open and the burned gas will be release via the exhaust pipe installed on the car.
I hope you will find my writing helpful.

How diesel engines work
Compressing any gas raises its temperature, the method by which fuel is ignited in diesel engines. Air is drawn into the cylinders and is compressed by the pistons at compression ratios as high as 25:1, much higher than used for spark-ignite engines. At near the end of the compression stroke, diesel fuel is injected into the combustion chamber through an injector (or atomizer). The fuel ignites from contact with the air that, due to compression, has been heated to a temperature of about 700–900 °C (1300–1650 °F). The resulting combustion causes increased heat and expansion in the cylinder which increases pressure and moves the piston downward. A connecting rod transmits this motion to a crankshaft to convert linear motion to rotary motion for use as power in a variety of applications. Intake air to the engine is usually controlled by mechanical valves in the cylinder head. For increased power output, most modern diesel engines are equipped with a turbocharger, and in some derivatives, a supercharger to increase intake air volume. Use of an aftercooler/intercooler to cool intake air that has been compressed, and thus heated, by the turbocharger increases the density of the air and typically leads to power and efficiency improvements.

In cold weather, diesel engines can be difficult to start because the cold metal of the cylinder block and head draw out the heat created in the cylinder during the compression stroke, thus preventing ignition. Some diesel engines use small electric heaters called glow plugs inside the cylinder help ignite fuel when starting. Some even use resistive grid heaters in the intake manifold to warm the inlet air until the engine reaches operating temperature. Engine block heaters (electric resistive heaters in the engine block) connected to the utility grid are often used when an engine is turned off for extended periods (more than an hour) in cold weather to reduce startup time and engine wear. Diesel fuel is also prone to 'waxing' in cold weather, a term for the solidification of diesel oil into a crystalline state. The crystals build up in the fuel (especially in fuel filters), eventually starving the engine of fuel. Low-output electric heaters in fuel tanks and around fuel lines are used to solve this problem. Also, most engines have a 'spill return' system, by which any excess fuel from the injector pump and injectors is returned to the fuel tank. Once the engine has warmed, returning warm fuel prevents waxing in the tank. Fuel technology has improved recently so that with special additives waxing no longer occurs in all but the coldest climates.