以下都可以
continual=continuous 都是形容词,两者差不多
在时间、空间、顺序、物质组成或范围广度上连续不断
continuing 动名词表示持续耐久
例 a continuous hot weather 持续高温天气
continual noise 连续不断的吵杂声
a continual diet of vegetables 长期吃素
The brain needs a continuous supply of blood.大脑需要不间断的供血.
She suffered a continuous bout of illness lasting six months.
她患病发作已持续了六个月.
The horizon is a continuous line.地平线是一条不断延伸的直线.