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器。

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

这决定了负载均衡器如何请求分发到后端服务器。

So load balancers can operate at different layers.

因此, 负载均衡器可以在不同的层上运行。

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

第二是负载均衡器在 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器流量分配给什么?

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器时，有两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，我们的负载均衡器接收该请求并其发送到我们的 API 网。

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

从这里开始, 客户端发送的请求会触及我们的负载均衡器。

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

然后, 我们的负载均衡器是一第 7 层负载均衡器。

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.

负载均衡器在多服务器之间分配流量，在您要进行的几乎每系统设计面试，它们都是可扩展性的键。

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器的请求，并其转发到应的服务。

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 层负载均衡器很有趣，因为它们可以根据请求的实际内容（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，这三组件（客户端、负载均衡器和 API 网）出现在您所做的大约 90% 的系统设计面试。