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1·There are exercises that tauten facial muscles.

有些练习可以让面部肌肉紧绷起来。《柯林斯英汉双解大词典》

2·When I grin, the stitches tauten.

当我咧嘴而笑，针脚便会绷紧。

3·I suddenly felt the fishing line tauten.

我突然感到鱼竿的绳子拉紧了。

4·Every nerve in his body seemed to tauten: he pulled out his wand, moved into the shadows beside the decapitated elf heads, and waited.

哈利全身的每根神经都紧张起来，他拔出魔杖，躲进那些小精灵脑袋旁边的阴影里等待着。