Due to difficult terrain, known as "two lock and key unparalleled in Beijing, the Great Wall the first hurdle," said.

因地势险要，素有“两京锁钥无双地，万里长城第一关”之称。

youdao

The calculation methods of lock chamber wall are mostly approximate with many assumptions, which still need proving both by theory and experiments.

对于岩基上船闸闸室墙的计算方法大多均是作了许多假定不完善的近似方法，其假定是否成立仍需在理论、实验上进一步探讨。

youdao

Taking Wannianzha Lock engineering as an example, the causes, treatment methods and preventive measures of cracks in thin-wall structures are expounded briefly.

以万年闸工程为例，对薄壁结构的裂缝原因、处理方法以及预防措施进行了简单论述。

youdao

Wall Street was under lock down too, with the New York Stock Exchange and the Nasdaq cancelling trading.

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