-
底部封闭，一个铅制成的平衡重物。
The bottom in close up. A balance weight made of lead.
youdao
-
还有其他可能的铅中毒来源，比如净化水系统的管道是由铅制成的；
The water purification system may be the source of lead poisoning.
youdao
-
还有其他可能的铅中毒来源，比如净化水系统的管道是由铅制成的；
The water purification system may be the source of lead poisoning.
youdao