The development of a broadly tunable excimer laser source by exploiting bound-free transitions of electron beam-pumped diatomic and triatomic are gas halides is described.
宽带可调谐准分子激光源，是电子束泵浦的双原子和三原子稀有气体卤化物通过束缚-自由跃迁产生的。
2
With one bound Jack was free.
纵身一跃，杰克自由了。
《柯林斯英汉双解大词典》
3
But it was free and I was bound — there was no way of meeting.