扩展基的英文怎么说

扩展基的英文：
n. expansion base

It's the expansion of a river.
这是河流的延伸部分。

This is nothing but the binomial expansion.
这不过是二项展开式。

They have an expansive grassy play area.
他们有一片广阔的游乐草地。

They have played an expansive style of rugby.
他们采用向外展开打法打了一场橄榄球。

That was a vast expanse of grassland.
那曾是一片广阔的草原。

the base of the standard
旗瓣基部

The player on second base was spiked by the runner on base.
在第二垒的运动员被跑垒人的钉鞋踩伤了。

Is it theresilient base mount type?
这就是弹性底座安装式 ？

FLOOR/BASE PLATE MOUNT
地面/底板安装

This book panders to base interests.
这本书是迎合低级趣味的。