The human body is composed of more than twenty chemical elements. The four most important ones (constituting 96.2% of body weight) include:

人體由廿多種不同的化學元素組成，最主要的四種（佔人體重量的 96.2%）包括：

Less important elements (constituting 3.7% of body weight) include:

較次要的元素（佔了人體 重量的 3.7%）還有：

The remaining 0.1% belongs to the family of trace elements.

餘下的 0.1% 為微量元素。

The chemical proportion of the human body will change as the age advances. For instance, the amount of calcium inside the human body progressively decreases as the age increases, which makes the bone become brittle and easier to break.

人體內化學成分的比例，會隨著年齡而有所增減。例如，人體內的鈣會隨著年齡的增長而逐漸流失，使骨頭變得脆弱，容易折斷。