mindmap root((持续)) continual implies a close or unceasing succession or recurrence: ~ showers the whole weekend. continuous usually implies an uninterrupted flow or spatial or temporal extension: the ~ roar of the falls. constant implies uniform or persistent occurrence or recurrence: lived in ~ pain. incessant implies ceaseless or uninterrupted activity that is viewed as undesirable or distasteful: the ~ quarreling frayed her nerves. perpetual suggests unfailing repetition or lasting duration: the fear of ~ torment after death. perennial implies enduring existence often through constant renewal: a ~ source of controversy.