你所要做的就是填写并寄出表格。All you do is complete and post off a form.如果我不寄出照片，他将有所察觉。If I don't send a picture, he will smell a rat.将答案写在明信片背面寄出。Send your answers on the back of a postcard....

“寄出”的英语可以翻译为：send off，pack off ...