daily variation of yinyang

• 往来

daily variation of yinyang的用法和样例：

例句

1. We could hear the distant drone of the traffic.
   我们可以听到远处传来的车辆往来的嗡嗡声。
2. We do business with a number of US companies.
   我们跟几家美国公司有生意往来。