1.turn back 往回走

例句：The police turned back the demonstrators.

警察把示威者擋了回去u38xP3IYKAIinj3-d(w。

2.decide to 決定

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

這一切都取決于你決定要相信什么Zmx.N73~,+r。

3.laser pointer 鐳射筆

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

保衛(wèi)者系統(tǒng)包括一個多波段鐳射筆/跟蹤器和一個紫外線導(dǎo)彈預(yù)警傳感器|4.uMaXB@BdlWsCv1.。

4.precautionary measure 預(yù)防措施

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

然而，這份報告補充說，盡管有上述結(jié)論，還是應(yīng)該開發(fā)出替換的標示作為防范措施~1Qyl,dU)~k。