two laser beams的用法和樣例：
例句
- Eventually the two beams will be fired in opposite directions with the aim of smashing together protons to see how they are made.
最終雙光束將發(fā)射猛烈地在相反的方向目標，粉碎質(zhì)子，看看它是如何取得的。 - In order to meet the need of laser doppler velocimeter inland,a dual-beam direction recognizable LDV is designed in this papper.
針對國內對激光多普勒測速儀的需求，本文設計并研制出一套雙光束可識別方向的激光多普勒測速儀。
