On the study of combustion process of internal combustion engines, the combustion process is usually studied in the time region.

在内燃机燃烧过程的研究中，通常把燃烧过程在时域上展开，即制取示功图。

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The top dead center (TDC) phase has a great effect on the result in the combustion analysis of internal combustion engines, so it is very important to obtain the dynamic TDC phase correctly.

在进行内燃机燃烧分析时，上止点相位对分析结果影响很大，正确确定内燃机动态上止点相位显得非常重要。

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Electric cars may be coming after 20years and it is still the era of internal combustion engines in the current time. But we can already find the internal combustion engine for the end.

电动汽车的时代也许还要20年才能到来，目前的时间仍然是内燃机的时代，但我们可以看到内燃机却已是强弓之末。

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Oil is found in relatively few places, and its energy density, pumpability and ease of use in internal-combustion engines makes it particularly well suited as a transportation fuel.

ECONOMIST: Unconventional gas

These devices, which work by combining hydrogen with oxygen from the air to produce electricity, are popular candidates to replace internal-combustion engines in road vehicles.

ECONOMIST: The dawn of micropower

"We really and truly expect that fuel cells are going to double the fuel efficiency of the best internal combustion engines and in some cases triple it, " Roan said.

CNN: Bus showcases fuel cell technology