控制城市交通污染，必须严格控制机动车的排放。
Control of urban traffic pollution the motor vehicle emission should be controlled.
在采用袋装砂时，必须严格控制袋料质量和加工规格。
When the pocketed sand is used, the quality and size of the pocket must be controlled strictly.
为获得理想的预硫化效果，必须严格控制各阶段的反应条件。
In order to obtain the ideal presulfiding effect, the conditions of various stages should be controled strictly.
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