Tracers work both ways.

曳光弹是双向作用的。

The three tracers were similar in results.

所用三种示踪剂结果基本一致。

Once implemented, we will return the tracers back.

一旦实行，我们将会让炮弹轨迹回到游戏中。

Steam and electrical tracers must be listed and checked.

蒸汽和电加热伴热必须列表进行检查。

Temperature and electrical conductivity are good tracers.

温度、电导率是良好的示踪剂。