Hel
n. 赫尔（死亡及冥府的女神）；冥界
abbr. 人机工程实验室（Human Engineering Laboratory）
例句
He often hel me with maths when I have difficulty in it.
当我学数学有困难时，他经常帮助我。
HEL TD is a cornerstone of the Army's high-energy laser program.
HEL TD系统是美国陆军高能激光计划的基础。
The HEL TD demonstration program will support the transition to a full-fledged Army acquisition program.
HEL TD演示项目将支持美陆军全面采购计划的转型。
