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1.fine-tune 调整
例句：Participants will receive $20,000 in capital in exchange for equity and begin a 12-week boot camp designed to fine-tune their business models and ready them for investors.
参与企业将以股权换取$20,000的资金支持，并开始为期12 周的新兵训练营，旨在调整他们的商业模式，为面向投资者做准备。
2.invest in 投资
例句：We should invest in ourselves and invest in others.
我们应该为自己投资为别人投资。
3.bone mineral density 骨密度
例句：The control group showed a decrease in soleus muscle mass and strength, the development of insulin resistance, and a loss of bone mineral density and resistance to breakage.
控制组的老鼠表现出比目鱼肌质量和力量下降，胰岛素抵抗上升，骨密度和抗折能力降低。
4.happen to 发生在
例句：Please tell me if anything happened to him.
请告诉我他是不是遭到了什么意外?
