Methotrexate
[化] 甲氨蝶呤; 氨甲蝶呤
??? 情景例句
Typing is easy once you get the hang of it.
一旦你掌握訣竅，打字就很簡(jiǎn)單。
Have another piece of cake, please.
請(qǐng)?jiān)俪砸粔K蛋糕吧。
No, more, about 130 years ago. Most of the slave owners were rich farmers who lived in the south. They wanted to keep their slaves.
不，還要早，大約130年前。大多數(shù)奴隸主都是住在南方的富有的農(nóng)場(chǎng)主。他們想保留自己的奴隸。