当用户提交该表单后，脚本首先检查是否输入了一个或多个搜索关键字，如果一个也没有输入，则中断脚本处理并显示一条错误消息。

Once the user submits this form, the script first checks whether one or more search keywords were entered, and halts script processing with an error message if it finds none.

youdao

Quintura并没有简单的将搜索结果列出来，而是把和它关联的其他关键字用不同的大小集中在一起。

Instead of just listing results that match a keyword search, Quintura displays other related keywords clustered together in various sizes.

youdao

搜索引擎的非常聪明，知道什么时候关键字定位没有意义，并将惩罚你。

Search engine's are smart enough to know when keyword positioning does not make sense and will penalize you for it.

youdao