3 (fixed)
[temperature, speed etc] 恒 定 的 [héngdìng de]
constant、continual 和 continuous 都可以表示某事持续发生或一直存在。constant 表示某种事情总是发生或从未消失过。He was in constant pain...Jane's constant criticism... continual 表示某事在一段时间内经常发生,尤其指人们不愿看到的情况。...his continual drinking...continual demands to cut costs... continuous 表示某事一直延续而不停止或毫无停止的迹象。...days of continuous rain...a continuous background noise...