造血

Generally, fuel oil boilers or electrical heater as the subsidiary heating systems are adopted.

本论文基于先进的热泵技术，通过实验设计，开发以太阳能为主要热能来源、热泵为辅助的24小时中央热水供应系统。

They very have also suggested that the very concept of abstract numbers - the idea of a oneness, a twoness, a threeness that applies to any class of objects and is a prerequisite for doing anything more mathematically demanding than setting a table - is itself far from innate.

他们还表示抽象的数字概念，如可表示任何一类物品并且是他们还表示抽象的数字概念，桌子有更高数学要求的任何事时都必备的一，在做比摆桌子有更高数学要求的任何事时都必备的一，二，三意识，远远不是天生就具备的。