1.periodically adv. 定期地;周期性地;偶尔;间歇
Meetings are held periodically to monitor progress on the case.
定期举行会议以监督案件的进展 。
2.bystander n. 旁观者;看热闹的人
It looks like an innocent bystander was killed instead of you.
看起来是一个无辜的旁观者当了你的替死鬼 。
3.assault n. 攻击;袭击 vt. 攻击;袭击 vi. 袭击;动武
The gang assaulted him with iron bars.
该团伙用铁棒袭击了他 。