There are no hard and fast rules about the use of hyphens in English.

He stuck hard and fast to his principles.

他严守自己的信条.

Nevertheless, no hard and fast line can be drawn between popularization and the raising of standards.

　　但是, 普及工作和提高工作是不能截然分开的.

This is not a hard and fast rule.

但这并不是一个牢靠不变的规则.

There are no hard and fast rules necessary to begin the practice of yoga.

在进行完一整套动作后,狗狗和主人开始练习瑜伽的休息术.

There are no hard and fast rules in this game.

这种游戏没有什么严格的规定.

Our factory has a hard and fast rule against smoking.

我们工厂严格规定不许吸烟.

You can not lay down hard and fast rules.

你不能制定严格的规则.

There are no hard and fast rules, but rather traditional guidelines as to who pays for what.

关于谁来支付什么费用并没有明确的规定，只是遵循传统的准则罢了。

Use this advantage to hard and fast one tank at a time.

利用这一点,快又狠地打击一个目标.

At the moment there's no hard and fast timetable.

目前还没有明确的时间表。

I believe in living passionately hard and fast like a steam train, and touching souls.

我相信生活要充满激情,对人放开怀抱,像一辆蒸汽火车般坚定不移, 而且拥有令人感动的精神.

Road and bridge area on this year's public funds management has a hard and fast rules.

路桥区对今年的公用经费管理有着硬性规定.

We must make it a hard and fast rule against smoking in the office.

我们必须严格规定:办公室里不准吸烟.

We stuck hard and fast on the rocks in the middle of the river.

我们被阻滞在河当中的礁石上.

The firm hard and fast rules to limit the scope of our work.

公司没有限制我们业务范围的严格规定.

I didn't make any hard and fast decisions.

我没有做出任何不容更改的决定.

No principles are hard and fast.

没有什么原则是一成不变的.

It is a hard and fast contract.

这是一项不能变动的契约.

No hard and fast line can be drawn between the two.

二者不能截然分开.

It is impossible to lay down any hard and fast rules.

想要制定出任何不容更改的规则是不可能的.