B2 [ C ] the bottom part of an object, on which it rests, or the lowest part of something基底,底座;底层,底子
More examples
Draw a perpendicular from the vertex of the triangle to its base.
Firefighters played their hoses onto the base of the fire.
Sand carried by the wind has hollowed out the base of the cliff.
The doctor manipulated the base of my spine and the pain disappeared completely.
The base of the bed was made of slats.
a place where there are military buildings and weapons and where members of the armed forces live军事基地
More examples
A team of commandoes got the hostages out from the rebel base.
They radioed their base for help.
The aircraft base is protected with specially designed shelters which are built to withstand ground and air attacks.
Military bases were protected by captured enemy soldiers who were housed there as a human shield.
The violence is unlikely to stop without military strikes against terrorist bases.
[ C ] one of the four positions on a square that a player must reach to score a point in the game of baseball(棒球运动中的)垒
[ C ] the activity or people from which someone or something gets most of their support, money, etc.基础,支柱
C2 [ C usually singular ] the main part of something主要成分
[ C usually singular ] specialized mathematics the number on which a counting system is built基数
[ C ] specialized chemistry a chemical that dissolves in water and combines with an acid to create a salt碱,盐基
not showing any honour and having no morals贱的;卑下的,卑鄙的
B2 to have a particular town or area, etc. as the main place that you live and work in, or where you do business from以某处(城市或地区等)作为生活、工作、经商的主要地点;将某地设为总部
More examples
He was based in London during the war.
He's based in Paris during the week.
The company is based in Coventry.
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