So, the timing signal should be set cautiously with the aid of other measures such as adjusting the interval duration, propaganda of traffic safety and rules.
因而应谨慎采用机动车交通信号灯倒计时装置，并应辅以绿灯间隔时间调整、交通安全宣传教育和明确交通规则等措施。
Objective to explore the mode of propaganda and education for donating blood voluntarily and to enhance the proportion of donators unpaid for ensuring the blood safety.
目的探索无偿献血宣传教育模式，提高无偿献血率，确保临床用血的需要和安全。
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