1. 给…注射
    To inject someone with a substance such as a medicine means to put it into their body using a device with a needle called a syringe.

    e.g. His son was injected with strong drugs...
           他儿子被注射了烈性麻醉药。
    e.g. The technique consists of injecting healthy cells into the weakened muscles...
           该技术是把健康细胞注射到衰弱的肌肉里面。

2. 添加,注入(某种特性)
    If you inject a new, exciting, or interesting quality into a situation, you add it.

inject

    e.g. She kept trying to inject a little fun into their relationship...
           她一直在设法为他们的关系增添一些情趣。
    e.g. The result might inject more sense into future bargaining.
           其结果可能为未来的谈判注入更多的理性。

3. 投入(金钱或资源)
    If you inject money or resources into a business or organization, you provide more money or resources for it.

    e.g. He has injected £5.6 billion into the health service.
           他已经为公共医疗卫生服务投入了 56 亿英镑。