• Cleanliness is all-important in mould steels.

• Complete dependence is critical (or of critical importance, or of crucial importance) in control components.

• This is a method of outstanding (or exceptional, or unique) importance.

см. тж. жизненно важен для; играть важную роль; исключительно ~

• This inertness is the most salient characteristic of the DNA molecule.

• A critical question ...

• The spectrophotometer is a key element in the process.

• Whenever dyeing is a paramount requirement ...

• An essential (or important) feature of the device is ...

• A major application of the high vacuum environment is in the design of vacuum tubes.

• A vital part of the magnetron is the permanent magnet.

• This approach is of significance despite the complexity of ...