1·Through friction, this flexing produces heat in the moon's interior capable of melting ice.
通过摩擦，这种弯曲在月球内部产生了能够融化冰的热量。
2·It's a good idea to reintroduce knee range of motion as early as you can by gently flexing and extending the knee to the extent possible.
尽早通过轻柔的弯曲和伸展，来恢复膝盖的活动范围。
3·Flexing or extending the arms, for example (the motions involved in either pulling or pushing) can make someone more apt to like or dislike something, respectively, researchers have reported.
比如，研究者已经发现，弯曲或伸展手臂(涉及推或拉的运动)会分别使人更倾向于喜欢或不喜欢的某一个东西。
4·I read that the knee flexing of the dance originated from African people living in Argentina. They danced with their knees bent to show off their skill.
我从书上看到过。舞蹈中膝盖弯曲动作源于生活在阿根廷的非洲人。他们跳舞时弯曲膝盖以显示自己的舞技。
5·This is a direction of flexing that belts, and especially joints, are not normally designed for.
这是一个方向弯曲，皮带，特别是关节，通常不会设计的。