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okeratin5/6）。当在电镜下观察时，恶性间皮瘤细胞的微绒毛比肺腺癌的更细长，在恶性间皮瘤中其长度与直径的比例常大于10。CK7和CK20也有助于区分原发...

help him is my duty.帮助他是我的责任。（help 后跟宾语）2 非谓语动词可以带有自己的状语或逻辑主语。Working under such...

c structure and managing inflation expectation. This will enable us to maintain ...

our mulberries here curve green-threaded branches; and at last you think of ret...