Objective To study the effect of chitosan in the prevention of fibrous scar formation in the epidural space after laminectomy.

目的 观察选择性脊神经后根切除术椎板切除后硬膜外几种防瘢痕粘连物质的作用并探讨其机制。

On his way to the lift, he looked back to us or was it me his eyes pointing?

当他要进电梯时，他回头看我们（或者说是我，他的眼光？

Galileo was a famous Italian scientist by whom the Copernican theory was further proved correct.

伽利略是意大利著名的科学家，他进一步证明了哥白尼学说是正确的。