Total arable land dynamic balance equation stipulates the control subject for the regional arable land system un-der the base of predictable technology and population pressure.

在可预知的技术进步和人口压力背景下，耕地总量动态平衡方程为区域耕地系统的状态规定了调控目标；

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As a result, the total population was divided into four groups: control (44), low exposure (48), middle exposure (48) and high exposure (48).

因此所调查人群分为四组，其中对照组44人，低暴露组48人，中暴露组48人，高暴露组48人。

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As a result, the total population was divided into four groups: control (44), low exposure (48), middle exposure (48) and high exposure (48).

因此所调查人群分为四组，其中对照组44人，低暴露组48人，中暴露组48人，高暴露组48人。

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