The drug improved mental alertness.该药有助于提神。Alertness, calmness, courage : he could see them all in the youngster's face.机警, 镇定, 胆量,都摆出在这年青人的脸上.We must maintain a military standard, an alertness, and never vary it.我们...
表示某人没义务做某事.State some body is under an obligation to do something.询问你是否不义务做某事.Asking if you are under an obligation to do something.有义务(做某事 )Be in duty bound to do sth....
If there's anything I can't stand it's an indecisive, wishy-washy customer.如果说我有什么不能容忍的话，那就是犹犹豫豫、挑来挑去的客户。The President's flip-flops on taxes made him appear indecisive.总统在税收问题上的一再反复使他显得优柔寡断。He was cri...