1. This is the disaster caused by seismic sea waves, or tsunamis. 这是由地震引起的海浪或海啸造成的灾难。
2. Tsunamis travel fairly slowly, at speeds up to 500 miles an hour. 海啸的传播速度相当缓慢,速度可达每小时500英里。
3. The Japanese call them "tsunamis", meaning "harbour waves", because they reach a sizable height only in harbours. 日本人称其为“海啸”,意思是“港湾浪”,因为它们只有在港口才能达到相当高的高度。