成语教你用

□back up 支持A: I agreed to your proposal at the meeting this morning. It wa 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。