I had a nagging worry that we weren’t going to get there.我有个挥之不去的忧虑，就是担心我们到不了那里 。I had a nagging feeling that I had forgotten something.我有某种不安的感觉，好像忘了什么东西似的。...nagging headaches.顽固的头痛Lenny still could not dissolve the na...
他的马甲收到腹部以上了.His waistcoat was riding up over his stomach.你最好把马甲穿在上衣里面.You'd better wear a vest under a coat.她戴了一顶漂亮的冕状头饰，而新郎也毫不逊色，身着一件非常讲究的刺绣西服马甲。She wore a lovely tiara but the groom, not to be outdone, had on a ve...
The gas , which is sulphur - free , contains 89 - 99 % methane, up to 6 % ethane, and 3 % propane.天然气不含硫, 含甲烷88-99%, 乙烷6%和丙烷3%.The method and the condition of separation epoxy ethane from dihydric alcohol are described.介...
To say he wasn't amused must be the understatement of the year.说他不感兴趣肯定说轻了.To say I'm disappointed is an understatement...说我失望那是说得太轻了。He was getting very hard to live with, and that's the understatement of...
Using benzene as internal standard, the calibration factors of derivative of aldehydes 2,4 - dinitrophenylhydrazine ( DNPH ) were measured.将醛类物质与2, 4- 二硝基苯肼 ( DNPH ) 的衍生反应液直接进样,以苯为内标物,测定了甲醛 、 乙醛等醛类物质DNPH衍生物的校正因子....