首先让我们来看看可供你选择的两种帮你搜索的服务功能：搜索引擎和主题目录检索。

Let's start by looking at the two services you can choose between to aid you in your search: search engines and subject directories.

youdao

首先让我们来看看可供你选择的两种帮你搜索的服务功能：搜索引擎和主题目录检索。

Let's start by looking at the two services you can choose between to aid you in your search: search engines and subject directories.

youdao