SOS

名词 sos:

1. an internationally recognized distress signal in radio code

名词 so:

1. the syllable naming the fifth (dominant) note of any musical scale in solmization
   同义词：sol, soh, so

1. The bill should have been$29.54 so I round it up to$30.
   账单本来应该是92。54美元，我凑个整数把它调高到了30美元。
2. I promise I won't spend more than a hundred pounds in the sales so don't get your knickers in a twist.
   我答应我去逛贱卖场时花费不会超出100英镑，因此你不必惊慌。
3. The ship is sinking, and I have to send a SOS.
   船要沉了，我不得不发出紧急求救信号。