It may be controllable distractions, unfocused efforts, or a poor environment.

它可能是可控制的焦虑，不尽心的努力，或者一个糟糕的环境。

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Each cycle is made up of specific factors in hosts and agents within a specific environment such that if all the factors are present, then diseases or conditions of poor health will occur.

每个周期都是由特定的宿主和病原在特定环境中形成，如果每个因素都存在，那么疾病就会爆发。

youdao

Each cycle is made up of specific factors in hosts and agents within a specific environment such that if all the factors are present, then diseases or conditions of poor health will occur.

每个周期都是由特定的宿主和病原在特定环境中形成，如果每个因素都存在，那么疾病就会爆发。

youdao