Oneway to get round this limitation is to set up a laser in mid-air, its beam sampling the molecules along its path as it returns to the source.
避免这个局限的一种方法是在两者之间放置一个激光器，它的光束在返回光源时对途径的分子进行取样。
2
Using a laser, the robot can make highly accurate welds and position itself for each one a lot faster than it could if it were spot-welding in the normal way.
与传统方法相比，利用激光，机器人可以高精度高效率的完成焊接。
3
In the scheme the ion is excited by two laser fields tuned to the first lower and higher vibrational sidebands, and then by onelaser tuned to the ion transition in an alternative way.