... 后备电源 back source 里眼镜back spectacles 逆代法 back substitution ...
双语例句
1
Yonder, at the back of the room, old Hauser had put on his spectacles, and, holding his spelling-book in both hands, he spelled out the letters with them.
教室后头，奥泽尔老人戴上了眼镜，两手捧着识字课本，跟我们一起拼读。
2
A doctor in spectacles was cutting something in his brown, muscular back.