分子生物学的新技术使最近的工作成为可能，这种新技术能在环境中检测到低浓度的病毒 DNA。
The recent work has been made possible by new techniques of molecular biology that allow viral DNA to be detected at low concentrations in the environment.
4-H 俱乐部的成员同意跟进这个项目直到完成，他们能从建设性的工作成果中得到满足。
Members of the 4-H club agreed to follow the project through to completion, because they receive satisfaction from the results of constructive work.
这涉及管理开发成本、操作成本、生产力，和市场中的产品功效。
These involve managing the cost of development, cost of operations, productivity, and product efficacy in the market.
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