Personal attacks on referees should be off limits, no matter how incompetent they are.

不管裁判多么无能，对他们进行人身攻击都是万万不可的。

youdao

My 15 tour mates and I soon learned to our disappointment that the bridge and engine room would be off limits because of security concerns.

我和15名旅伴很快失望地得知，由于安全原因，舰桥和机械室不能进入。

youdao

Anything that could be viewed as front-running would be off-limits, as would any company-specific comments that don't match up exactly to the information in Facebook's registration documents.

任何可能被视为抢跑的行为都是被禁止的。此外，关于公司的任何评论必须与Facebook上市登记文件中的表述完全一致。

youdao

Now that its bonds are rated junk, they will be off limits to investors that buy only investment-grade debt.

WSJ: Slovenia Bond Sale Postponed

Eventually, they balanced the budget by dipping into the state's tobacco-settlement cash, which was meant to be off limits.

ECONOMIST: State budgets

And nothing can be off limits, including spending in the tax code, particularly the loopholes that benefit very few individuals and corporations.

WHITEHOUSE: Weekly Address: Cutting the Deficit and Creating Jobs