conj.: why

employee, servant, official, staff member, retainer, functionary, operative, office employees, officeholder, personnel, officer, staff_member, office worker, clerk, staffer

right side, head, head-on, face, front, the right side, facade, obverse/right side, the obverse side, frontispiece, frontal, frontage, obverse side, obverse

能指示方向的仪器

v. 张开（眼睛）, open (one's eyes)

extremely important, vital, crucial, essential