Mound Builder

同根派生

By about A. D. 500 the Mound Builder culture was declining, perhaps because of attacks from other tribes or perhaps because of severe climatic changes that undermined agriculture.
大约是在公元500年，营冢文化开始衰落，这也许是由于其他部落的进攻，也许是由于重大的气候变化对农业造成了破坏。
Has the builder presented his bill yet?
营造商把帐单送来了吗？
A mound of stones erected as a memorial or marker.
锥形石冢一堆石头，用于表示纪念或标志
He lay in his bunk under a mound of blankets.
他躺在铺上，身上盖了一大堆毯子。
There is a mound of papers on my desk.
我的办公桌上放了一大堆文件。