sustained grade的意思|示意

Adverse outcomes, defined as death, sustained ventricular tachycardia (VT), and increase in New York Heart Association functional class to grade II or IV, occurred in 21% of patients.

确定死亡、持续性室性心动过速、纽约心功能分级增加到II或IV级等负性结果发生率为21%。

A new Peabody study of the Tennessee Voluntary Pre-K program reports that pre-K works, but the gains are not sustained through the third grade.

对田纳西州志愿学前教育项目的一项皮博迪新研究报告称，学前教育是有效的，但这种效果不会持续到三年级。