泵管直徑難燃性difficult: adj. 1.困難的,(工作等)艱難的。 2.執(zhí)拗的,頑 ...difficult-flammability plywood: 難燃膠合板flammability: 可燃性的; 晚燃性; 易燃的; 易燃性能be difficult of: 難于, 不易be difficult to: 很難去……下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯