使用一个框架公约是好的，易于使用，扩展和维护，如轨道。

It is good to use a Framework with conventions, easy to use, extend and well maintained, like Rails.

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如轨道基准面、道渣厚度、轨道平直度等不合格，塔机运行晃动或歪斜；

Such as track datum, ballast thickness, flatness of the track is not qualified, the tower crane swing or skew;

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乘客的物品如落入轨道，请不要自行捞捡，应寻求车站工作人员的帮助。

If passengers drop anything onto the track, they should ask the subway staff for help.

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