英语翻译
问题描述：
英语翻译
Estimates indicate that the aquifer contains enough water to fill Lake Huron,but unfortunately,under the semiarid climatic conditions that presently exist in the region,rates of addition to the aquifer are minimal,amounting to about half a centimeter a year.
rates of addition to the aquifer are minimal这里怎么翻译?
答
统计数据显示,蓄水层里有足够的水能填满休伦湖.但不幸的是,在这个地区常年半干旱的气候条件影响下,雨水能补给到蓄水层的概率是非常小的,总数大约只有一年5毫米.
这里的addition是翻译难点,原意为 附加物,附属物.我认为根据语境应该是指能流入到蓄水层的水.