1、The Wrights also returned to flying unpowered gliders off dunes.
懷特兄弟還是重新使用手動滑翔機，從沙丘上俯沖而下。

2、A man without aspirations is like an unpowered boat which has to go with the waves.
沒有志向的人，就好比沒有動力的船，只能隨波逐流。

3、Having little wind, this area greatly affects unpowered ships.
有微風的時候，這個區(qū)域非常容易影響無動力航船。

4、An autogiro is supported in flight by unpowered rotating wings.
旋翼機在飛行中是靠無動力旋轉式機翼來支持的。