Standard practice is to separate the plastic by boiling circuit boards on stoves , and then leach the metals with acid .
标准的流程是首先用火炉加热电路板至沸腾，分离出塑料，然后用酸过滤金属。
Spreading wastewater over fields , and allowing it to leach back through the soil into local waterways , turns out to be a reasonable way to purify it .
Coal ash contains toxic heavy metals , including arsenic , cadmium , mercury and lead , which leach into water systems and get blown into the air during windy days
煤灰含有有毒的重金属，包括砷、镉、水银和铅，这些会从供水系统中过滤处理，在有风的时候吹到空中。
Sleepless nights and fights over whose turn it is to change diapers can leach the fun out of a relationship .
