5. Flutter experiment is always the attention-getting topic in airplane flight test, because it directly affects the flight safety.
颤振试验历来是飞机试飞中最受关注的课题,因为它直接影响飞行安全。
6. The birds fluttered excitedly in the trees.
鸟儿在树林中兴奋地飞来飞去。
7. Her heart began to flutter with fear.
她的心因害怕而开始柁柁跳。
8. She flutter ed nervously about, going from room to room.
她紧张不安地从这房间到那房间四处走动。
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