n.镇静；沉着
Keep calm; don't lose your composure. 保持镇静，不要惊慌失措。
He could see that she was struggling to preserve her composure. 他看出她是竭力故作镇定。
He showed great composure in difficult situations. 他在困难环境中表现得极沉着。
n.失态；慌张
