bend one's elbow

Bend one knee up and keep the other extended.

弯曲一个膝盖，而让另一个膝盖伸展。

Something as innocuous as a cotton swap can bend one of the delicate electrical pins.

用一些象棉线圈般无害的东西，来弯曲成一个精美的电别针。

But instead of taking a single path, light can bend around the object in one of two, or four different routes, thus doubling or quadrupling the amount of information scientists receive.

但是光并非只走一条路径，而是可以从两个或四个不同路径中的一个绕过物体，这样科学家可以获得两倍或四倍的信息量。