A tooth which has been hit hard may discolour.受过重击的牙齿可能会变色。Plastic tends to discolour with age.塑料久而久之便会退色。Benzoyl peroxide can cause fabric to discolour on contact. Use with care.过氧化苯可能导致织物脱色, 请小心使用....
Salt water is much more conductive than fresh water is.盐水比淡水的传导性强得多。Prolonged therapy should be avoided since it is conductive to toxic reactions.应避免延长治疗,因为它可导致毒性反应.Aerobic dance is conductive to the health.有氧舞蹈有助于健康....
马斯特斯用了约20个钟头才到达那所房子。It had taken Masters about twenty hours to reach the house.我经常会为我的壁画画上10到20个嵌套图画。I frequently paint between 10 and 20 insets for my murals.我每天游20个来回。I swim 40 lengths a day....
Margaret resides with her invalid mother in a London suburb.玛格丽特同她病弱的母亲住在伦敦郊区。At best Nella would be an invalid; at worst she would die.内拉往好里说会落下残疾，往坏处说可能会生命不保。A passport that is out of date is invalid.护照过期是无效的....