Insects would make it impossible for us to live in the world; they would devour all our crops and kill our flocks and herds , if it were not for the protection we get from insect - eating animals.昆虫会使我们无法在这个世界上生存: 如果不是由于...
A white chalk chalks white on a black blackboard.一根白色的粉笔在黑色的黑板上写白字.His steed was by chalks the best.他的马是最好的.The prisoner has walked his chalks , and is off to London.那囚犯逃走了, 逃到伦敦去了....drawing a small picture with coloure...
Anything with strong gravity attracts other things to it.任何有较强重力的物体都会对其他物体产生引力。Not all acts of vengeance are of equal gravity.并非所有的报复行为都同等恶劣。Increasing gravity is known to speed up the multiplication of cells.我们知道不断增加的引力...