V-T If you flex your muscles or parts of your body, you bend, move, or stretch them for a short time in order to exercise them. 屈伸 (肌肉或身体某部分)
He slowly flexed his muscles and tried to stand.
他缓慢地活动了一下肌肉，想站起来。
N-VAR A flex is an electric cable containing two or more wires that is connected to an electrical appliance. (电器用的) 花线 [英国英语]
to flex your muscles →see muscle
As Europa orbits its planet, however, it flexes due to the gravitational tug-of-war between it, its sister moons, and Jupiter.
然而，当木卫二绕其行星运行时，由于姊妹卫星和木星之间的引力拉锯战，它会弯曲。
Is the answer that, like a tall pine tree, the Japanese pagoda—with its massive trunk-like central pillar known as shinbashira—simply flexes and sways during a typhoon or earthquake?
答案会不会是这样：日本宝塔——由于有着一根叫做“塔心柱”的巨大树干状中心柱子——就像一棵高大的松树般，在一场台风或地震中仅仅只会来回摇摆和弯曲呢？
She sees it coming and flexes her stomach muscles.
她看到了并且绷起了她腹部的肌肉。
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