So then why are there two high and low tides every day?

那么为什么每天都有两次涨潮和落潮呢？

At very low tides they scramble dangerously round the exposed, rusting bones.

低潮的时,他们冒着危险在暴露在外的锈迹斑斑的支架上攀援.

Seaweeds are Brown algae; mosslike carpets of red algae are seen at low tides.

最常见的海藻是棕色海藻；在较浅的潮汐中能看到成片的苔藓般红色海藻。

Nature has always displayed this duality in terms of its cycles - the winter and spring, planting and harvesting, the high and low tides, day and night, it’s everywhere you look.

无论在何处，你总能看到大自然也在循环播放着这种两重性—冬天与春天、播种与收获、潮起与潮落、白天与黑夜。