They feel I need to bulk up, and to improve my upper body strength.

他们觉得我需要变粗壮些，并增强上身的力量。

《柯林斯英汉双解大词典》

His coaches and his father urged him to bulk up.

他的教练和父亲都敦促他要变强。

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Ahermit thrush gulps down a wild berry to bulk up on antioxidants.

一只鸫吞下野生的浆果来囤积抗氧化剂。

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FORBES: Listen To Arthur Laffer

He is a good organiser and has started to bulk up and become a real physical presence.

BBC: Jeremy Guscott column

As capital flows accelerated, the banks were encouraged to bulk up like fitness freaks taking to steroids.

ECONOMIST: The unintended consequences of past financial reforms