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.
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.
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.
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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