1. The start of the database definition is
marked by the database keyword on line 6.

在第6行资料库定义的开始是通过资料库关键字来标识。
3. Coronary artery vasospasm can cause a transient, abrupt,
marked decrease in the diameter of an epicardial coronary artery.

冠状动脉血管痉挛能造成一个暂时的,突然的,显著的心外冠状动脉内径的减少。