由于气候炎热，因此，保持环境卫生至关重要。

The hot climate made sanitation extremely important.

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请保持环境卫生。

Keep environment tidy, please.

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保持环境卫生整洁，不随地吐痰，便溺，不乱扔废弃物。

Keep the park tidy. Dispose of litter properly.

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保持机器及其环境的干净、整洁和安全(环境卫生)。

Keep the machines and environment in clean, tidy and safety condition (Housekeeping).

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保持机器及其环境的干净、整洁和安全(环境卫生)。

Keep the machines and environment in clean, tidy and safety condition (Housekeeping).

youdao