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1·When those boundaries are crossed, an American's body will visibly stiffen and his manner will become cool and aloof.

如果越过了这些界限，美国人的身体会明显变得僵硬，他的态度也会变得冷漠。

2·The blood supply to the skin is reduced when muscles stiffen.

肌肉发僵时，皮肤的供血量就会减少。《柯林斯英汉双解大词典》

3·These clothes restrict your freedom of movement and stiffen up the whole body.

这些衣服使你的手脚难于自由活动，使整个身体也僵硬起来。《柯林斯英汉双解大词典》

4·The jelly will stiffen as it cools.

果冻冷却后会变硬。

5·Stiffen the cream by adding gelatine.

通过增加白明胶使奶油变硬。

6·At the same time their tissues stiffen.

在此同时他们组织变硬。

7·We must stiffen them all up and allow no weakness.

我们一定要使他们都坚强起来，不允许有丝毫软弱。

8·The shape helps stiffen the glass against wind loads.

这一形状可以帮助玻璃减少风的负荷。

9·The promise of a reward might stiffen their resolve.

答应给他们奖励可以坚定他们的决心。

10·The boy was seen to stiffen and then to fall from the tree.

人们看到男孩蹬了一下腿，然后从树上掉了下来。