当番茄植株的茎被切断时，一小时内记录了25次超声波疼痛声，同时记录了15次烟草植物的超声波疼痛声。
When the tomato plants' stems were cut, 25 ultrasonic pain sounds were recorded in an hour, and at the same time, 15 ultrasonic pain sounds were recorded from the tobacco plants.
本文论述了聚合物溶液超声降解的影响因素；对超声波降解机理及超声降解动力学进行了讨论。
The effects of ultrasonic degradation of polymer in solution are reviewed in the paper. The mechanism and the kinetics of ultrasonic degradation of polymer in solution are introduced.
备有超声波塑料焊接，超声波金属焊接，电阻焊接样机等。
With ultrasonic plastic welding, ultrasonic metal welding, resistance welding prototype and so on.
应用推荐