斯茂拉赫翻了一通，挑出一双我所见到过的非常难看的棕色皮鞋。

Smaolach rooted around and picked out the ugliest brown shoes I had ever seen.

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因此，双核茂金属催化剂的研发已经成为一个热点，大量的文献表明双核茂金属催化剂确实能改善聚合物的分子量分布，得到性能更为优异的聚烯烃材料。

The dinuclear metallocene catalysts, which have two diffeent active sites in one molecule, should be able to produce polymer with broader or bimodal molecular weight distribution.

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而羧基邻位有酚羟基存在时，则配体以双齿形式与钛配位形成二茂钛六元环状化合物。

And if there is a hydroxyl in ortho position of carboxyl, the oxygen of hydroxyl and carboxyl in ligand are bound to ti to form hexatomic cyclic compound.

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