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。

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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。

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Now to put it back together and cut some basic keys in the wall to lock in the RTV core mold in it's proper position.

现在将它放回一起和削减一些基本的钥匙在墙上的锁，在室温硫化模具的核心，在它的正确的位置。

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

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