It was an old mine shaft. In a small clearing beyond I found the remains of a bucket and a rusting can.
这是一处旧时的矿井,在不远处的空地上我看到当时遗留下来的水桶和生锈的铁罐。
2
For this application, the bucket feed mechanism, RBC media, and Bio-Clarifier shaft are installed in concrete tankage conforming to the shape and dimensions of the Bio-Module steel tankage.