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.
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.
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。
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