建立蔗田的立体生产比单纯种蔗能提高经济效益。
The results from field experiments showed that the economic benefit of multicropping in sugarcane field were much higher than those of sugarcane alone.
目的：临床观察研究单纯种植体支持和天然牙与种植体联合支持修复下颌游离端缺失的效果。
Objective: To evaluate the clinical results of just implant supported fixed prostheses and tooth-implant supported fixed prostheses in the treatment of mandibular posterior free-end edentulism.
这种现象出现在一些单纯种中。分子生物学家正在探索一种方法，能够把知识集中到某些能够有益于人类的事物上。
In a few very simple species, that appears to be the case, and molecular biologists are exploring ways to parlay that knowledge into something that could benefit humans.
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