These are great exercises for toning the back of the arms the triceps.

这组动作对练习手臂后侧的肱三头肌十分有效。

Make an incision to expose the tricep here.

这里开个切口暴露出肱三头肌。

Typically with Bob in this situation we're using biceps and tricep muscles, but he has to be able to fire those independently.

这种情况下通常使用二头肌和三头肌，但他必须能够独立地操纵这肌肉。

So the biceps will shorten while the triceps will lengthen or relax, pulling up the arm and making it bend at the elbow.

所以肱三头肌伸展或者放松时，肱二头肌就，完成胳膊举起，向着手肘弯曲的动作。

It's ok, I know how it is. This machine here will work out your upper body, mainly your triceps and biceps. Are you looking to develop strength or muscle tone and definition?

没关系，我知道。这台机器首先从你的上半身开始起作用，主要是肱三头肌和二头肌。你是想增强力量还是锻炼肌肉和线条？

If you looking for a Rom-com, you'll know to avoid The Expendables because of the poster with a skull, guns, biceps, triceps...is, is that a trapezoid? Just way too much testosterone.

如果你想看浪漫喜剧，你知道要避开《敢死队》，因为那海报上有头骨、枪、二头肌、三头肌… … 还有梯形的吗？反正就是有很多睾丸素（男性荷尔蒙的一种）。