Mr Dennis said he had requested access to a telephone.丹尼斯先生说他已经请求使用电话。"Go on, don't leave us in suspense," Dennis said.丹尼斯说：“接着说，别吊我们胃口了。”Seeing his chance, Dennis moved in for the kill.看到机会来了，丹尼斯开始采取行动。...
It is occasionally necessary to use a number system to designate the position of each ligand.有时需要用一种编号系统来标明各配体的位置.Macromolecules cannot approach the ligand owing to steric hindrance of the matrix.由于载体的立体位阻的关系,大分子化合物不能接触到...