名詞 stand by:

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

動詞 stand by:

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

形容詞 stand by:

1. ready for emergency use
   同義詞：standby

1. How can you stand by and let him treat his dog like that?
   他那樣虐待他那只狗，你怎么能袖手旁觀呢？
2. I'll stand by you whatever happens.
   無論如何，我都支持你。