重点讲解：
1. sign up for
（和…）签约；雇用；报名（参加课程）；
eg. Many men sign up for the army because they can not get ordinary jobs.
由于找不到工作，许我男人都报名参了军)Es#wa|exC。
eg. Her parents urged her to sign up for a computer course.
父母督促她报名参加计算机课程Me;TS-hlGYe.w。
2. opposite sex
异性；
eg. These people, usually men, seem unable to relate to the opposite sex.
这些人，通常为男性，似乎不懂得如何跟异性相处xE|pT=@D!dkD。
eg. Body language can also be used to attract members of the opposite sex.
肢体语言也可以用来吸引异性的注意RM5Q)4;kR=。
3. lose one's head
不知所措；头脑发昏；没主意；慌里慌张；
eg. He was not a man to lose his head in an emergency.
他这个人在紧急情况下是不会糊涂的D#*4+_qXVGRQJ。
eg. I never thought that I was gonna lose my head
我从没想过我会不知所措[!DtX1jmSx~GF4。