precursor中文什么意思

n.
1.前辈，前驱，先锋；前任。
2.预兆；先兆。
3.预报器。
+更多解释...4.【原子能】前驱波；初级粒子。

• active precursor:    活性前体
• angiotonin precursor:    血管紧张素前质; 血管紧张肽原
• auxin precursor:    生长素前体

例句与用法

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1. Crazing is the invariable precursor of brittle fracture .
   出现小裂纹必然是脆性断裂的前兆。
2. These include the chlorophyll precursor protochlorophyllide a .
   这些受体包括叶绿素的前体原叶绿酸a。
3. In the past this had been the precursor to strong decisions .
   要是在过去，这就是要采取强力行动的预兆。
4. The immediate transcript of a trna gene is known as precursor trna .
   TRNA基因的直接转录物叫做tRNA前体。
5. Cyanide can serve as precursor for the amide nitrogen of asparagine .
   氰化物可以作一个天门冬酰胺的酰胺氮前体。

英文释义

名词

1. something that precedes and indicates the approach of something or someone
   同义词：harbinger, forerunner, predecessor, herald
2. a person who goes before or announces the coming of another
   同义词：forerunner
3. a substance from which another substance is formed (especially by a metabolic reaction)