1. My luck is on the ebb.
   我的运气每况愈下.
2. The tide ebbs and flows twice in 24 hours.
   潮水每24小时涨落两次。
3. Business is at rather a low ebb.
   商业颇不景气。
4. Crime is on the ebb.
   犯罪正在减少。
5. We sat on the beach and watched the tide ebb.
   我们坐在沙滩上看退潮

　1个名词解释