上海长江口是我国的典型河口，海域水面开阔，资源丰富，具有多种生态系统服务功能。
The typical estuary—Shanghai Yangtze River Estuary, which is full of resources and with widen surface, has many ecosystem services.
两条小船翁翁地驶出洞口，到了开阔的水面上。
Both boats purred out of the cave mouth and into open water.
1400年之后不久，造船工人开始开发一种新型的船，这种船设计合理，可以在开阔的水面上航行：它就是卡拉维尔号。
Shortly after 1400, shipbuilders began developing a new type of vessel properly designed to operate in rough, open water: the caravel.
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