1. Each year, the city digs up about 10,000 tons of old cobblestones as it rebuilds or repaves its streets. It used to discard them along with other rubble.
因为要重建或重铺街道，巴黎每年都要挖掘出大约1万吨鹅卵石，以前总是把它们和其他瓦砾一起丢掉。
来自互联网
2. Each year, the city digs up about 10,000 tons of old cobblestones as it rebuilds or repaves its streets. It used to discard them along with other rubble.
