纽约市人行横道的很多步行按钮之前曾经有作用，但如今只是安慰按钮。

Many walk buttons at pedestrian crossings were once functional in New York City, but now serve as placebo buttons.

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肿瘤的侵袭转移是多步骤完成、多因素共同作用所引起的极其复杂的过程。

Invasion and metastasis are very complex multistep processes which are affected by many factors.

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人类肿瘤的发生是多基因、多步骤共同作用的结果，抑癌基因在这一进程中扮演着重要的角色。

Cancer in humans is the result of a multi-gene, the combined effect of multi-step process, and tumor-sup-pressor genes play an important role in this process.

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