When you walk with a backpack, you know how the stuff inside sways from side to side?

当你背着背包走路时，你知道包里的东西是如何左右摇晃的吗？

They swayed from side to side.

他们左右摇摆。

Driffield took my bicycle, and I, reluctant but unable to withstand his friendly violence, clumsily mounted. I swayed from side to side, but he held me with a firm hand.

德里菲尔德推过我的自行车。我虽然很不愿意，但是却无法拦挡他那友好的行动，我笨手笨脚地跨上车， 来回晃悠，可是他用手牢牢地扶住我。

His head swayed from side to side as he went on all fours across the clear space in the moonlight, until he came to a rotten log.

当他在月光下四肢着地穿过空旷的空间时，他的头左右摇摆，直到他来到一根烂木头前。