One time - tested method for relaying information is the dead drop.
有一種屢試不爽的傳遞情報的方式被稱為死信箱.
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His methods are reliable and time - tested.
他的方法相當可靠,而且屢試不爽.
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A Course of Instructions With Time Tested Practical Rules of Trading in Grains.
行之有效的谷物實用交易規(guī)則.
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