旁觀者[páng guān zhě]
bystander; spectator; onlooker; looker-on; stander-by
例句：
1、壹個旁觀者遭到了警察的制止。
One?onlooker?had?to?be?restrained?by?police.?
2、這情景使我和每壹位旁觀者都很驚詫。
The?scene?was?astonishing?to?me,?to?every?one?standing?by.?
3、看起來是壹個無辜的旁觀者當了妳的替死鬼。
It?looks?like?an?innocent?bystander?was?killed?instead?of?you.?