half range of tide

例句：

1. 1. The tides are at their halfrange, and the beach is deserted.
   潮汐处于半涨落状态，海滩无人。
2. 2. The fishermen were out inthe half range of the tide.
   渔民们在潮汐的半涨落时出海捕鱼。
3. 3.The scientists studied the half range of thetide to understand its impact on the ecosystem.
   科学家们研究了潮汐的半涨落来了解其对生态系统的影响。