后者涉及氢转移的同时逐出中性分子碎片（N，O-双齿配体）。

The latter process involves the expulsion of the neutral species (N, O-bidentate ligands), accompanied by hydrogen migration.

youdao

提出了拓扑方法，即考虑分子图顶点的性质，直接用酯类化合物的分子碎片的特征值为主元来构建邻接矩阵。

It is proposed a new topological method of adjacent matrix of esters which was constructed by taking the characteristic value of the pieces of ester compounds as principal diagonal element.

youdao

刚开始，类乙型蛋白以长条状的形式出现，接著被一种酵素分解为分子般黏状的细小碎片，然后纠结在一起，形成了所谓的“病灶”。

Initially the amyloid appears as a long protein that is then cut by enzymes into shorter fragments that become molecularly sticky and clump together, forming a plaque.

youdao

So, antigens are molecules or pieces of molecules that stimulate an immune response.

所以 抗原是可以激发免疫反应的,分子或分子碎片

耶鲁公开课 - 生物医学工程探索课程节选