departure的动词形式是depart
departure是名词。既是可数又是不可数名词。
例如:He says his departure is nothing to do with the resignation calls.他说他的离开与辞职要求无关。
The airline has more than 90 scheduled departures from here every day.该航空公司每天都有90多架航班从这里起飞。
动词depart词义为离开，离去，背离，违反等。
词义为离开，离去时，可以跟from，for。请注意意思有所不同。from是离开某地， for是前往某地
例如:
The train will depart from Shanghai.火车将离开上海。
He departed for the city this evening.他今天傍晚前往这座城。
