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1·I held a sharp blue edge of steel tightly between thumb and forefinger to each fist.

我每只手的拇指和食指之间都紧紧地捏着一片锋利的蓝钢刀片。

2·The reason I'm writing on this, is that I accidentally trapped my left hand in afoldableladder, and now my left hand thumb is completely black and blue and can hardly move itself.

我写此话题的原因是，我的左手不小心被一个折叠式扶梯夹了一下，以至于现在左手的大拇指一片青紫，无法移动。

3·They returned to saying they felt blue or were green with envy or had a green thumb.

人们又开始谈论起，某某有点儿蓝色的忧郁，某某嫉妒的眼睛都红了，某某是个绿手指。