The teachers usually pin up the best work on the board.
老师们通常把最好的作业钉在展示板上。
The electrical pin cleaning work is particularly important, consumers should pay attention to.
其中电插脚的清洁工作尤为重要，广大消费者要重视。
The teachers usually pin up the best work on the board.
老师通常把最好的作业钉在展示板上。
Brake pin of oil drill had fractured in procession of work.
石油钻机刹车盘销轴在工作过程中断裂。
Brake pin of oil drill had fractured in procession of work.
石油钻机刹车盘销轴在工作过程中断裂。
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