build up:
(1)建立
例句:You do build up a good relationship with the client. 你确实与客户建立了良好的关系。
(2)加快,增进,增强
例句:We can build up the speed gradually and safely.我们可以逐步安全地加快速度。
She has always been encouraged to swim to build up the strength of her muscles.她总是被鼓励去游泳以增强肌肉力量。