These cilia are specialized for this task and their beating creates a current that expediently and beautifully directs every nearby thing into the waiting mouth of the microorganism.

些纤毛专门项任务，它们的跳动会产生一股电流，方便而漂亮地附近的所有东西引导到微生物的等待口中。

His grandfather had expediently sided with the Soviets and retreated with them as the Nazis advanced.

他的祖地站在苏联一方，当纳粹进攻时，随同苏军撤退。