surface drop technique

例句：

1. 1. The surface drop technique is a method used to treat soil contamination.
   表面滴落技术是一种用于处理土壤污染的方法。
2. 2. In the surface drop technique, water is applied directly onto the surface of the material being treated.
   在表面滴落技术中，水直接施加到待处理材料的表面。
3. 3. The surface drop technique has been shown to be effective in removing heavy metals from soil.
   表面滴落技术已被证明能有效从土壤中去除重金属。