Helicopters perform poorly in hot weather and at high altitude.

直升机在天气炎热和海拔较高时表现不佳。

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This can result in applications that perform poorly and are difficult to maintain.

这会使应用程序性能低下并且难以维护。

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This can result in applications that perform poorly and are difficult to maintain.

这会使应用程序性能低下并且难以维护。

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