operating threshold的用法和樣例：
例句
- When the base of the layer reaches some critical temperature threshold, it ignites a carbon bomb that rages for hours.
當這一層碳的底部溫度達到臨界溫度閾時(shí)，這個(gè)碳炸彈就會(huì )被點(diǎn)燃，接著(zhù)它就會(huì )爆發(fā)數小時(shí)。 - This paper presents a group of new experiments on human olfactory threshold measurement.
本文介紹了一組新編的人群嗅閾測量實(shí)驗。
