vt.延长，拖延

英文释义

a. To extend in space or length; as, to prolong a line.

a. To lengthen in time; to extend the duration of; to draw out; to continue; as, to prolong one's days.

a. To put off to a distant time; to postpone.

词干

prolong 延长
→ pro-，向前，long，长的。引申词义延长。