实体环境可能使用实体电脑或虚拟机器。
A physical environment might use physical computers or virtual machines.
如果我们仅仅保留了实体环境，那最终会将二者都丧失殆尽。
But if we save only the physical environment, we will ultimately lose them both.
如果挽救了生物的生存环境，也就等于同时不自觉地挽救了实体环境。
If we save the living environment, we will also automatically save the physical environment.
环境级别将整个系统视为一个单一的实体：黑盒子。
The Context level treats the entire system as a single entity: a black box.
同时，您必须使用实体或虚拟环境来执行自动化测试。
You must also use a physical or virtual environment to run your automated tests.
同时，您必须使用实体或虚拟环境来执行自动化测试。
You must also use a physical or virtual environment to run your automated tests.
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