现在午夜了，是时候睡觉了。用动词的过去式表示假设意义。
It's just struck midnight. It's high time we went(go)to bed.
这个假设很有意义，可能是我们读过的所有理论中最有意义的。
That hypothesis makes a lot of sense, maybe the most sense of all the theories we read about.
欧文斯和奥尔森假设，如果类胡萝卜素是稀有的或对健康有要求的，则通过着色指示的类胡萝卜素的存在在配偶选择的背景下将是有意义的。
Owens and Olson hypothesize that the presence of carotenoids, as signaled by coloration, would be meaningful in the context of mate selection if carotenoids were either rare or required for health.
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