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十分有效。

Bob Goodman controls his bionic arm by contracting his biceps and triceps muscles.

鲍勃·古德曼控制他的仿生手臂收缩他的二和。

These single-joint isolation exercises, like curls, side raises, and triceps pushdowns, only tend to focus on one muscle group at a time.

像弯举，侧平举还有下推都是单关节局部练，它们只专注于锻炼一群。

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

所以在肱伸展或者放松时，肱二就会收缩，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，主要是肱和二。你是想增强力量还是锻炼和线条？

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，你会知道要避开《敢死队》，因为那海报上有骨、枪、二、… … 还有梯形的吗？反正就是有很多睾丸素（男性荷尔蒙的一种）。