您要查找的是不是：
- 前信使RNA,前mrnapremessenger RNA
- 前信使RNA, 前mRNAprecursor mRNA(Pre-mRNA); premessenger RNA(Pre-mRNA)
- 30年前他还是孩子的时候就离开了家，从此，他家里人一直没有得到他的消息。He ran away as a boy thirty years ago, and his family has never heard from him since.
- 禁食引起肠萎缩，血浆胰岛素和IGF－1浓度降低以及空肠IGF-1信使RNA（mRNA）水平的明显降低，再喂养可逆转这些改变。Fasting induced intestinal atrophy, reduced plasma insulin and IGF-1 messenger RNA(mRNA) levels; these changes were reversed by refeeding.
- 30多名党员已经退出了从前的党，成立了一个新的独立的党。Over30 MPs have now broken away from their old party to form a new, independent one.
- ＂据新闻记者透露，这两个国家在达成和平协议前已经秘密接触多次了。＂News men divulged that the two countries had met together secretly several times before they arrived at the peaceful agreement.
- 在要减去的数字前有一个减号。There is a minus before the number to be subtracted.
- 我得把前胎打一下气。I have to get my front tyre blown up.
- 他炸马铃薯前先将马铃薯刮皮。He scraped the potatoes before frying.
- 窃贼被带到地方法官前受审。The thief was brought before the magistrate.
- 系主任在讲课前讲了几句开场白。The dean made a few introductory remarks before the lecture.
- 邮件在午夜前分拣装包。The mail was sorted and pouched by midnight.
- 1小时前天就下起了间断小雨、我想不会持续太久。It began to spot with rain an horn ago, but I don't think it will last.
- 5年前，我60岁时退休了。I bowed out five years ago when I was sixty.
- 几天前汤姆向玛丽求婚了。Tom proposed to Mary the other day.
- 癌前病变precancerosis
- "是不是两年前？" "差不多。""Was it two years ago?" "There or thereabouts."
- 3天前他就觉得察出有危险。He sniffed out the danger three days ago.
- 临死前的antemortem
- "谁如命运似的催着我向前走呢？""Who drives me forward like fate?"
