hover
动词 hover:
be undecided about something; waver between conflicting positions or courses of action
同义词:vibrate, vacillate, oscillate
move to and fro
同义词:linger
hang in the air; fly or be suspended above
be suspended in the air, as if in defiance of gravity
同义词:levitate
hang over, as of something threatening, dark, or menacing
同义词:brood, loom, bulk large