Para.3 What's more,that small quantity of carbon dioxide in the air is essential to life. essential 名 n.a basic thing that you cannot live without必需品 e.g.Because I live in a remote village,I regard my car as an essential. 8 We only had time to pack a few essentials. 的 adj.necessary;needed必不可少的 e.g.It is essential for/to us to try to decide whether television is a blessing or a curse.Para.3 ❖ What’s more, that small quantity of carbon dioxide in the air is essential to life. ❖ essential ❖ n. a basic thing that you cannot live without 必需品 ❖ e.g. Because I live in a remote village, I regard my car as an essential. ❖ We only had time to pack a few essentials. ❖ adj. necessary; needed 必不可少的 ❖ e.g. It is essential for/to us to try to decide whether television is a blessing or a curse