prolong
/prəʊˈlɒŋ/verb
with obj.
1- extend the duration of延长, 拖长：
an idea which prolonged the life of the engine by many years.
延长了引擎寿命多年的想法。
1.1
- （一般作be prolonged）rare extend in spatial length〈罕〉延长：
the line of his lips was prolonged in a short red scar.
短短一道红色疤痕使他的唇线显得很长。
派生词
prolongation
nounprolonger
noun词源
late Middle English: from Old French prolonguer,from late Latin prolongare,from pro- 'forward，onward'+longus 'long'.