每日英语：back up
back up 支持A：I agreed to your proposal at the meeting this morning. It was a good one.
B：You should have backed me up then when I needed it.
A：The matter was too complicated to explain.
A：我同意你今天早晨在会上的建议，建议很好。
B：那么你就应该在我需要的时候支持我的。
A：事情很复杂，不太好解释。
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