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。

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Second, although the amount (weight) of herbicides applied has increased in recent years, that parameter is a poor measure of impacts on human health or the natural environment.

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This happens in a poor market environment because institutional investors finally take their profits or start to shift their vast portfolios into more defensive stocks, such as utilities, food, etc.

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