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环数 [huán shù]
cylinder number
- 当环数大于10后两种情况下衍射场光强变化都不明显；
If number of rings is more than 10, diffraction field distribution change unobvious. - 射箭比赛的胜负是以运动员射中箭靶目标的环数计算的，命中靶的箭越靠近中心，所得环数越高。
The result of archery is decided by the scores of the arrow hitting various scoring zones. The nearer the arrow is to the center of the target face, the higher the scores. - 除了维持无营养物条件下对芳环数≤3芳烃类化合物的良好降解能力外，对芳环数为4~6芳烃类化合物的降解能力也有所提高。
Besides all bacteria strains maintaining good ability of biodegrading aromatic compounds that have less than 3 rings, the ability of biodegrading aromatic compounds with 4~6 rings is improved.
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