核心区别
continuous = 不间断的、连续的（中间无停顿）；continual = 频繁的、反复的（中间有间断）。
例句对比
The brain needs a continuous supply of blood.（大脑需要不间断的血液供应。）
She was tired of the continual interruptions.（她厌倦了频繁的打断。）
记忆技巧
continuous = ous = one uninterrupted sequence（一条线到底）；continual = al = again and again（反复来，中间有间隔）。
想象：continuous是一条实线─────；continual是虚线─ ─ ─ ─ ─。