It is important to...
例句：It is important to drink enough water every day.
An important part of...
例句：Exercise is an important part of a healthy lifestyle.
Play an important role in...
例句：Teachers play an important role in shaping young minds.
Of great importance
例句：This meeting is of great importance to our future plans.
Most importantly
例句：Most importantly, always be honest with yourself.
Equally important
例句：Diet and exercise are equally important for good health.
Too important to ignore
例句：Climate change is too important to ignore.