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tough cake ['tʌfkeɪk]
archit. 精铜 (含铜约 99%)
construct. 精铜含铜约99%
met. 韧铜; 火精铜含铜约99
tech. 精铜 (含铜约99%)
tough copper cake ['tʌfkeɪk]
tech. 韧铜
tough cake
: 2 phrases in 1 subject
Oil / petroleum2