threshold of activation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，這個碳炸彈就會被點燃，接著它就會爆發數小時。 - 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驗。
