Translation of "extras" into Chinese

You can obtain this hardbound 256-page book, with extra-large print by filling in and mailing the coupon below.

你也可以获得这本共256页、硬面和字体特大的书,你只需填好以下的联票寄来便行了。

The stiff upper wings perform the same function as airplane wings, whereas the more delicate underwings are used as a means of extra propulsion.

我们上层较挺硬的翅膀的功用有如飞机翼一般,下层较精细的翅膀则加添额外的推进力。