单词	copper-bottomed
释义	copper-bottomedˌcopper-ˈbottomed adjective Examples EXAMPLES FROM THE CORPUS This was not only copper-bottomed security, it was a chance to play with the big numbers and see what happened. able to be depended on:  a copper-bottomed guarantee
随便看	tractor-trailer Tracy, Spencer trad trade trade balance trade deficit Trade Descriptions Act trade discount trade fair trade gap trade-in trademark trade name trade-off trade price trader trade route trade school trade secret trade show tradesman tradespeople Trades Union Congress trade surplus trade union

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