It is to be hoped that he is merely drumming up business.但愿他只是在招揽生意。the steady drumming of the rain on the tin roof雨点打在铁皮屋顶上发出的有节奏的嗒嗒声He pointed up to the roof, through which the steady drumming of rain could be heard.他向...
Water - borne polyurethane is the predominant material of membrane pressing adhesive.水性 聚氨酯是真空吸塑胶的主要成分.The water - borne polyurethane was based on polyester diol and toluene diisocyanate etc.以聚酯多元醇、甲苯二异氰酸酯为主要原料合成了 水性 聚氨酯...