要加强劳动保护，改善作业环境条件，合理安排出乘和休息时间，缓解疲劳的发生。
Labor protection should be reinforced, working environment improved and proper working schedule and resting holidays arranged to ease off engine drivers' tiredness from work.
根据作业环境条件选择130名工人，分为对照组、低浓度接触组和高浓度接触组，同时将25名轻度苯中毒工人列为中毒组。
According to the working environment 130 workers were divided into control group, low con centration group, and high concentration group.
根据不同的环境条件和作业要求，其系泊方式也是不同的。
The style of mooring is different according to environment and operation requirements.
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