One time - tested method for relaying information is the dead drop.
有一种屡试不爽的传递情报的方式被称为死信箱.
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His methods are reliable and time - tested.
他的方法相当可靠,而且屡试不爽.
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A Course of Instructions With Time Tested Practical Rules of Trading in Grains.
行之有效的谷物实用交易规则.
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