PHRASAL VERB 改善；加强；改进；提高 If you beef up something, you increase, strengthen, or improve it. 改善；加强；改进；提高 [Also VERB n PREPOSITION]
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...a campaign to beef up security. [VERB PREP. noun (not pronoun)]
加强安全的运动
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Both sides are still beefing up their military strength. [VERB PREP. noun]
双方仍在增强各自的军事力量。
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...a beefed up police presence. [VERB-ed PREP.]
有所增强的警力
SYN strengthen, increase, build up, enhance