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The pressure on the enemy is building up.
对敌人的压力在不断加强。
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The clouds are building up.
云越积越厚。
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The US is continually building up its armed forces.
美军正持续加强它的三军。
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They built the wall up.
他们把墙加厚了。
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Many a large and big business has been built up from small ones.
很多大企业都是从小规模发展起来的。