Tree density in the forest decreased with the increases of height class and diameter class, whereas species abundance did not increase.

栎类次生林乔木的密度随高度级、径级的增加而递减，但树种丰富度却不随树木的密度增加而增加。

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You have an abundance of world-class architects who fully understand the local context… Use them!

你们有那么多了解本地背景的世界级建筑师……用他们！

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And it will determine whether there's going to be an abundance of good middle-class jobs in America.

WHITEHOUSE: President Obama Speaks at National Governors Association Meeting | The White House