The British Parliament comprises/consists of/is composed of the House of Commons and the House of Lords.
英国国会是由下议院和上议院组成的.
Water is composed of the elements hydrogen and oxygen.
水是由氢元素和氧元素组成的.
She appeared composed and self-possessed before the large audience.
在大批观众面前,她显得很沉着安详。