A fast train does the journey to Ottawa in three hours.快车在3小时以内走完去渥太华的旅程.Fantastic. How long are you staying in Ottawa?太棒了! 你在渥太华能呆多久?I'm calling from downtown Ottawa.我是在渥太华市中心打电话.In 1937 he was seconded to the Roya...
It is a layer of guanine crystals which glow at night.这是的氨基羟尿环水晶层数发光在晚上.These crystals are then embedded in a plastic, and the plastic is extruded as a wire...然后将这些晶体嵌入一块塑料，再把塑料挤压成线。We tried to grow some copper sulphate ...