leach
/liːtʃ/verb
with obj. and adverbial of direction
1- make (a soluble chemical or mineral) drain away from soil, ash, or similar material by the action of percolating liquid, especially rainwater（从土壤、灰等中）沥滤（可溶化学物质、矿物）：
the nutrient is quickly leached away.
营养成分很快就被沥滤出来。
1.1
- no obj., with adverbial of direction(of a soluble chemical or mineral) drain away from soil, ash, etc. in this way（可溶化学物质、矿物）被从土壤、灰等中沥滤出来：
coats of varnish prevent the dye leaching out.
青漆涂层防止染料被滤掉。
1.2
- with obj. subject (soil, ash, etc.) to this process滤析（土壤、灰等）。
词源
Old English leccan 'to water'， of West Germanic origin. The current sense dates from the mid 19th cent.