Sleds pulled by dogs are in common use in the Arctic.狗拉的雪橇在北极地区很常用.Will there be a nursery full of little grav - sleds and data disks?你说会不会有个幼儿园装满了小芯片和数据碟?A competition in which these sleds race against a clock.'逆&#...
标出在Wh - 问句中,wouldyou和couldyou是如何被简化的?Note how would you and could you are reduced in Wh - questions.简化的理想模型可代替复杂的系统.The complicated system maybe represented by a simplified conceptual model.必须牢记这种简化的后果.These simplificati...
In olden days the coasts of England were harassed by the Vikings again and again.古时候,英国沿海一带一再受到北欧海盗的窜扰.All over the world, oil spills regularly contaminate coasts.在世界各地，油溢出物经常污染着海岸。Of necessity they are sited near the co...