secondary
adj. 第二位的；次要的
eg. A distinction should be made between the primary and secondary tasks.
要区别主要的和次要的任务。

polaroid camera
波拉一步相机；即显胶片照相机
eg. He had been fiddling with a new Polaroid camera.
他曾经摆弄过一个新的宝丽莱相机。

paperback
平装本；纸面本
eg. There are paperback mysteries on the bookshelf.
书架上有平装的神秘小说。

overflowing
adj. 溢出的；充满的
eg. A great poem is a fountain forever overflowing with the waters of wisdom and delight.
一首伟大的诗篇有如一座喷泉永远喷出智慧和欢愉的水花。

run its course
自然发展
eg. We can't cure the disease; it must run its course.
我们治不了这种疾病, 只好听其自然。

sign off
停止活动
eg. You'd better sign off now or you'll miss the collection of the post.
你最好现在就将信收尾，不然会错过邮递员的收信时间。

anew
adv. 重新；再
eg. He played the tune anew.
他把那支曲子重新奏了一遍。