For DI to work, you must have an interface whose concrete class you can inject into the consumer of the behavior you desire.
为了让DI工作，必须拥有一个接口，可以把这个接口的具体类注入到需要的行为的消费者中。
Spend time thinking about what users might do on your site and model worst case scenarios to inject into the testing process.
请多花些时间考虑用户可能在您的站点中进行哪些操作，并对最糟糕的用例场景进行模拟，以注入到测试过程中。
A radiotracer is a radioactive compound that is safe to inject into patients and shows up clearly on a scan.
这种放射示踪剂是一种具有放射活性的复合物，具有注射安全且扫描显示清晰的优点。
A radiotracer is a radioactive compound that is safe to inject into patients and shows up clearly on a scan.
这种放射示踪剂是一种具有放射活性的复合物，具有注射安全且扫描显示清晰的优点。
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