The phrase the building blocks of life refers to the most basic biological and chemical units needed to support living plants and animals.
生命的构成要素指的是支持活体动植物所需的最基本生物及化学单位。
6 Minute English 六分钟英语
Earth's primordial soup lacked the building blocks of life – a phrase describing the most basic biological and chemical units needed to support living things, elements like oxygen and carbon.
A biological unit (abbreviated BU) consists of the smallest number of protein molecules which form a biologically active (e.g. catalytically active) unit.