Friction brake-drum
[化] 摩擦制動鼓
?? 詞語組成解析
brake
[brek]
n. 制動器，閘;剎車;阻礙;
vt.& vi. 剎（車）;
drum
[dr?m]
n. 鼓;鼓狀物;鼓聲;石首魚;
vt. 擊鼓;連打;反復講;鼓吹;
vi. 擊鼓;連打;拍翅;
??? 情景例句
I would also like to learn more about the culture behind the language.
我想學習和了解更多的關于語言之后文化的知識。
I won the most valuable prize!
我贏得了最高的獎賞！
So the number of stars that we know exist is now estimated at about 300 million million million.
因此，我們所知道的現有恒星數目估計約有30億×1000億顆。