航天飞机发射前的倒计时已经开始。

The countdown has begun for the launch of the space shuttle.

《柯林斯英汉双解大词典》

我们的轰炸机已经破坏了那些移动发射台。

Our bombers have knocked out the mobile launchers.

《柯林斯英汉双解大词典》

初学者的手枪发射的只是空弹。

A starter's pistol fires only blanks.

《牛津词典》

So, you might ask then well what is the significance of shooting different amounts of photons at a metal?

所以，你们可能会问向,金属发射不同数量的光子,有什么重要性？

麻省理工公开课 - 化学原理课程节选

So what we're saying here is the incident energy, so the energy coming in, is just equal to the minimum energy that's required to eject an electron.

这里我们来讨论一下，入射能量正好等于,发射出一个电子所需要的最低能量的情况。

麻省理工公开课 - 化学原理课程节选

Being and void, being and void, so now I've got my plus two little projectile coming in, and plus two zooms right through.

有和无，有和无，现在带两个正电荷的发射体进来了，两个正电荷正好穿过。

麻省理工公开课 - 固态化学导论课程节选