She diagnosed Liver Qi stagnation and sent Harvey to a Shen balancer.

安妮特：她诊断出肝气停滞，把哈维送到了沈平衡。

This determines how the load balancer distributes incoming requests to the backend servers.

这决定了负载均衡如何将传入请到后端服务。

So load balancers can operate at different layers.

因此, 负载均衡可以在不同的层上运行。

Second is the layer in the OSI model that the load balancer operates at.

第二个是负载均衡在 OSI 模型运行的层。

All right, but what are our load balancers distributing traffic to?

好吧, 但是我们的负载均衡将流量配给什么?

Now, when we talk about load balancers, there are two relevant points of discussion that are worth bringing up in your interview.

现在，当我们谈论负载均衡，有两个相关的讨论点值得在面试提出。

Our load balancer will then take that request and send it to our API gateway.

然后，我们的负载均衡将接收该请并将其送到我们的 API 网关。

From here, requests sent from the client hit our load balancer.

从这里开始, 客户端送的请会触及我们的负载均衡。

And then our load balancer is going to be a layer 7 load balancer.

然后, 我们的负载均衡将是一个第 7 层负载均衡。

Load balancers distribute incoming traffic across multiple servers, and they're key to scalability in just about every single system design interview that you're going to do.

负载均衡在多个服务之间配传入流量，在您将要进行的几乎每个系统设计面试，它们都是可扩展性的关键。

Now, the API gateway's responsibility is to take the incoming requests from the load balancer and forward them on to the appropriate service.

现在，API Gateway 的职责是接收来自负载均衡的传入请，并将其转到相应的服务。

Layer 7 load balancers are interesting because they can make routing decisions based on the actual content of the request, such as the URL or the header.

第 7 层负载均衡很有趣，因为它们可以根据请的实际内容（例如 URL 或标头）做出路由决策。

It's worth mentioning that these three components, the client, the load balancer, and the API gateway, are going to be present in roughly 90% of the system design interviews that you do.

值得一提的是，这三个组件（客户端、负载均衡和 API 网关）将出现在您所做的大约 90% 的系统设计面试。