沉着

It is no easy matter to keep one's head in the face of danger.

be brave and steady

with complete/perfect composure

be calm and imperturbable; be steady and calm

be cool and decisive

meet the attack calmly

deal/cope with sth calmly

act with composure; have the presence of mind to do sth

remain calm; maintain composure; preserve one's calmness

pigmentation

calcinosis