train的过去分词是trained还是trainnd

现在分词： training过去式： trained过去分词： trained 扩展资料

To make the training realistic the simulation operates in real time.

为使训练真实，模拟是实时运行的。

The company needs to improve its training and retention of staff.

公司需要改进对员工的培训和留用工作。

The train was dead on time.

火车正点出发。