Seawater, however, is alkaline.This alkalinity causes the glue to set.It solidifies into a foam within 30 seconds and becomes a flexible, leathery substance over the course of several hours.

碱性的海水使得胶质在30秒内凝结为泡沫，并在几小时内变为柔韧的皮状表面。

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Seawater, however, is alkaline. This alkalinity causes the glue to set. It solidifies into a foam within 30 seconds and becomes a flexible, leathery substance over the course of several hours.

碱性的海水使得胶质在30秒内凝结为泡沫，并在几小时内变为柔韧的皮状表面。

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As well as warming the oceans, rising carbon dioxide emissions are slowly reducing the alkalinity of seawater, which is also projected to have a detrimental effect on coral growth.

BBC: US vows 'huge' marine protection