A pulse tube refrigerator driven by a traveling wave thermoacoustic prime engine has no moving parts.
采用热声发动机驱动脉冲管制冷机，使彻底消除低温制冷机中的运动部件成为可能。
Since then she has lived as an advocate, a traveling lecturer, a woman driven by a sense of public mission. What's the mission?
从那以后，她成为了一名倡议者，一位旅行演说家，一位被公共使命感所驱使的女性。
Traveling wave ultrasonic motor is a new type of actuator driven by friction.
行波超声马达是一种靠摩擦力直接驱动的新型驱动器。
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