Stemming is the process of finding the constant part of a word, which is the fragment that stays the same no matter which word tense or mode is used.

确定词干是查找单词中不变部分的过程，它是单词中与时态和语气无关的保持不变的片断。

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If a language has no future tense, for instance, its speakers would simply not be able to grasp our notion of future time.

譬如，如果一种语言没有表示未来时态这一概念，说话人理所当然地，就无法抓住未来时间的这一理念。

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A tense moment, but the group quickly realizes there's no other way.

局势紧张起来，但是团伙们很快明白过来，已经没有别的办法了。

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Thanks to its unfortunate location, on a bleak corner between neighborhoods, there is no wait for a table, no tense negotiation with the hostess.

NEWYORKER: Thirstbar��vin

This official and other participants also said it was a remarkably tense and direct meeting that left no clear path to a compromise.

CNN: Bush, Congress face off over emergency funds

The latest revision by Lucas (putting the word "no" into Darth Vader's concealed mouth during a tense scene during which he had previously been mute) elicited this angry (and strongly-worded) Twitter response from Simon Pegg, the Shaun of the Dead writer and star.

BBC: Why Star Wars should be left to the fans