Neotetrine
四環(huán)素
??? 情景例句
It was very windy last fall.
去年秋天總刮風(fēng)。
If one desires to succeed in anything, he must pay the price.
如果想做成點事，就得付出代價一干。
Before you leave the lab, make sure the electricity is turned off and the windows are shut.
你們離開實驗室前，務(wù)必要關(guān)上電源，關(guān)好窗戶。