An oak tree cast its shadow over a tiny round pool.

一棵橡树在一个小圆池塘上投下了它的影子。

《柯林斯英汉双解大词典》

Select the entry for the database pool example and expand all the tree nodes.

选择数据库池示例的条目，并展开所有的树节点。

youdao

Expand the tree for the database pool sample.

展开数据库池sample的树。

youdao

Police say rival groups of asylum seekers attacked each other with tree branches, pool cues and broom handles.

VOA: standard.2009.11.24

The Pentagon memorial, opening Thursday, includes a bench, a tree and a pool for each of the 184 people killed there when another hijacked airliner crashed into the building.

CNN: Creating 9/11 memorials a slow process

"It's very significant to find a new clone variety because the tree's gene pool is very restricted and that is a disadvantage if they are threatened by disease as these are, " she said.

BBC: Black poplar trees found in Denbighshire lay-by 'unique'

Sam was a front-seat passenger in a black Vauxhall Astra which left the A449 and hit a tree, near the Island Pool pub, at about 01:00 GMT.

BBC: Tribute to a mother who died in Cookley crash