beachhead

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Where the Allies had won the critical battle for air supremacy was not over the beachhead.
在尚未结束的滩头阵地对决中，盟军赢得了关键的制空权的胜利。
They have moved abroad with “beachhead” offices that serve existing clients who do business around the world.
他们在海外成立“滩头堡”办事处服务世界各地做生意的客户。
A well camouflaged Marine is giving silent instructions to a Marine Corps jungle-trained dog on the front lines of the beachhead in Bougainville, Soloman Islands, on Jan. 13, 1944 during World War II.
1944年1月13日，第二次世界大战期间，所罗门群岛的布干维尔岛滩头阵地，一名伪装得很好的海军陆战队员命令海军陆战队一条在丛林接受过训练的军犬“保持安静”。

They had the half-desperate look of soldiers in a convoy, advancing toward a beachhead.
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In the past couple of years, e-commerce movers and shakers are capturing the beachhead.
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Tassal also sells fish in Japan and is trying to build a beachhead in Hong Kong.
FORBES: Magazine Article

an area of land near the sea or a river that an attacking army has taken control of and from where it can move forward into enemy country

A beachhead is an area of land next to the sea or a river where an attacking force has taken control and can prepare to advance further inland.