to be short

基本解釋

But why does the time frame have to be short?
那我要問，為什么是“短期”的才能有效？
"If you must have it, it needs to be short and well groomed," he cautions.
他警告說：“如果你非要這樣做的話，也要確保胡須要短而整齊。”
One of the things that everyone agrees about methane on Mars is that it has to be short-lived.
大眾普遍認同的一件事是火星上的甲烷的壽命極短。

And this may be cool enough to keep foods fresh, at least for a short time.
If we have a high frequency, what about the wavelength, long or short? All right. Good. So we should always be able to keep these relationships in mind.
如果頻率高，那波長是長還是短？,好，不錯，我們要記住這些關系,類似的。
麻省理工公開課 - 化學原理課程節(jié)選
There's a Midterm. That will be a short answer test that's intended to give you a chance to show how diligently you've been reading and coming to class.
我們會有一個期中考，會有一張簡答問卷,目的是能夠讓你們表現(xiàn)出,你們的勤勞，用功閱讀和按時上課。
耶魯公開課 - 現(xiàn)代詩歌課程節(jié)選

Simple exclusion of the opinion of front line people has long been proven to be short-sighted.
FORBES: Business Aviators - Is that all they are, or should be?