This traditional cleaning process is dangerous and requires cleaners to work within the machines in very close proximity to residues and residue dust.
这种传统清洁方法很危险，需要清洁人员在离机器很近的区域工作来清除残留物与残留灰尘。
It is laborious and expensive to dismantle and reinforce reconstruction engineering of brick and concrete structure and very dangerous during construction process.
砖混结构改造工程的拆除和加固是件费力费钱的事情，而且施工过程非常危险。
It is laborious and expensive to dismantle and reinforce reconstruction engineering of brick and concrete structure and very dangerous during construction process.
砖混结构改造工程的拆除和加固是件费力费钱的事情，而且施工过程非常危险。
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