during the high tide the water is most turbulent, while at low tide there is the possibility of hitting exposed rocks. Winds can play havoc, either too rough, or suddenly changing directions.
潮起時，海流最急，漲潮時，水滿好玩；退潮時，則礁石畢露，不經意就撞上；沒算準「時辰」就容易發生危險。