prolong

显著延长

to extend something for a noticeably great amount of time

将某事延长一段相当长的时间

不必要地延长

to extend something for longer than is needed or required

将某事延长超过需要或要求的时间

to extend something using unnatural or man-made means

to extend something for an unlimited or unspecified period

故意延长

to intentionally make something last longer

有意地使某事持续更长时间