Question

it is preferred that是什么意思

Answer 1

it is preferred that
这是首选，

例句:
1.
You are free to contribute anonymously, but it is preferred that you sign your comments with your name ( or handle).
你可以自由的匿名投稿，但是如果您签名注释上你的名字（或笔名）会更好。
2.
The use of quotation marks to indicate that it is not the authors preferred terminology.
引号的一种用法表示并非作者优先选取的词。
3.
If the preferred is cumulative, it means dividends that are not paid will be added up.
如果优先权是累积的，这就意味着没有支付的股息将加在一起来算。