stand by

名词 stand by:

1. something that can be relied on when needed
   同义词：standby
2. an actor able to replace a regular performer when required
   同义词：understudy, standby

动词 stand by:

1. not act or do anything
2. be available or ready for a certain function or service
   同义词：stick around, stick about
3. be loyal to
   同义词：stick by, stick, adhere

形容词 stand by:

1. ready for emergency use
   同义词：standby

1. How can you stand by and let him treat his dog like that?
   他那样虐待他那只狗，你怎么能袖手旁观呢？
2. I'll stand by you whatever happens.
   无论如何，我都支持你。