Both boats purred out of the cave mouth and into open water.

两条小船翁翁地驶出洞口，到了开阔的水面上。

《柯林斯英汉双解大词典》

youdao

Shortly after 1400, shipbuilders began developing a new type of vessel properly designed to operate in rough, open water: the caravel.

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。

youdao

The wreck of the Lady Elgin remains the worst loss of life on open water in the Great Lakes.

VOA: special.2009.11.11

At another time, Zeus destroys the wide camped army of people or wrecks their city with its walls, or their ships on the open water.

其他的时候,宙斯会屠戮露宿的人,摧毁他们的城墙,或在开阔的水域粉碎他们的船只

耶鲁公开课 - 古希腊历史简介课程节选

No bridge crossed as much open water.

VOA: special.2010.03.22

After the wide-open water of the estuary, the mangrove forest feels eerie and magical.

BBC: Relaxing among the Yucatan's flamingos

"If we lose our grasses, that area will shortly become open water, " Bourgeois said.

CNN: Severe drought threatens Louisiana coastal marshes

Beyond these patches are acres of open water that used to be storm-absorbing marshland.

NPR: Sabine Refuge Still Reeling from Rita's Wrath