That situation should have set up selection pressure for the ability to survive such infections.
那种情况应该会触发在那些传染病中幸存的强制选择。
Selection of the correct size pressure reducing valve is a relatively simple process.
正确选择减压阀的通径相对来说比较简单。
Selection of the correct size pressure reducing valve is a relatively simple process.
正确选择减压阀的通径相对来说比较简单。
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