In 1920 the rings were revived to represent the five continents with North and South America being represented by one ring.
1920年，这些环重新被用来代表包括五个大陆，南北美洲用其中一个环表示。
Although city officials would not comment on how many bids were received by today's 4 p.m. deadline, five groups announced that they had jumped into the ring.
虽然官方没有透露今天下午4点竞标截至时参与竞标的团队数目，但有5个团队已经宣布他们参与了竞标。
The five quinazoline compounds were prepared by using 2 amino 4,5 dimethoxy benzoic acid as original material, which underwent ring closing, halogenation and substitution.
方法：以2氨基4 ，5二甲氧基苯甲酸为原料，分别经过环化、氯代、取代等反应，合成了五种目标化合物。
Analysis by the use of equivalent circuit method is made for the five-arm ring, and two ways to improve it are found.
本文用等效电路法对五臂混合环进行了分析，并得出两种改进方案。
Olympic pentacyclic ring is symbolizing five continents' unity, world athlete by fair, frank competition and friendly spirit, meets at the Olympic Games.
奥运五环象征着五大洲的团结，世界的运动员以公平，坦率和友好的竞争精神，在奥运会上见面。
Five groups of B-ring substituted flavone and flavanone-7-O-isopropanolamine derivatives were synthesized and tested on rats for the ventricular arrhythmia induced by aconitine.
合成了五组B环具不同取代基的黄酮和黄烷酮- 7 - o -异丙醇胺衍生物，并进行了对乌头碱诱发大鼠室性心律失常预防作用的药理试验。
Five groups of B-ring substituted flavone and flavanone-7-O-isopropanolamine derivatives were synthesized and tested on rats for the ventricular arrhythmia induced by aconitine.
合成了五组B环具不同取代基的黄酮和黄烷酮- 7 - o -异丙醇胺衍生物，并进行了对乌头碱诱发大鼠室性心律失常预防作用的药理试验。
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