釉质是身体中最硬的组织最富于钙质.Enamel is the hardest structure of the body and the richest in Calcium.洗牙会对牙釉质造成伤害 吗 ?Does the meeting that wash a tooth cause harm to enamel?采用维氏显微硬度仪测定经饮料浸泡后牙釉质表面显微硬度的变化.The enamel surface microhardnes...
这出戏很糟糕,最后在观众的哄笑中停演了.The play was so bad that it was laughed off the stage.那小姑娘因同学的哄笑而局促不安.The girl was abashed by the laughter of her classmates.他在哄笑中尽力挽回尴尬的局面.He did his best to retrieve the situation, amidst some laugh...
我们爬山时,他掉队了.He fell behind when we were climbing the mountain.爬山时,汽车发动机可能发生故障.The car engine may stall as we go up the hill.老人爬山时蹒跚而行.The old man faltered as he climbed the hill....
光线用棱镜 、 光栅或干涉仪分解.The light is resolved by prisms, gratings, or by an interferometer.迈克耳孙和莫雷使用一台迈克耳孙发明的干涉仪.An interferometer invented by Michelson was used by Michelson and Morely.不很精确的射电干涉仪观测表明,这个源的角径约为1.5弧秒.Comparativel...