1.turn back 往回走

例句：The police turned back the demonstrators.

警察把示威者挡了回去u38xP3IYKAIinj3-d(w。

2.decide to 决定

例句：It all depends on what you decide to believe.

这一切都取决于你决定要相信什么Zmx.N73~,+r。

3.laser pointer 镭射笔

例句：The Guardian System consists of a multi-band laser pointer/ tracker and an ultraviolet missile warning sensor.

保卫者系统包括一个多波段镭射笔/跟踪器和一个紫外线导弹预警传感器|4.uMaXB@BdlWsCv1.。

4.precautionary measure 预防措施

例句：However, the report adds that despite this conclusion, alternative markers should be developed as a precautionary measure.

然而，这份报告补充说，尽管有上述结论，还是应该开发出替换的标示作为防范措施~1Qyl,dU)~k。