The refugees come across the border in vast numbers.
大量难民涌过边境。
In the past five years, there has been a vast improvement in graduation rates.
过去的五年内，毕业率大幅度提高。
adj. 广阔的；巨大的；大量的；巨额的
huge、
massive、
extensive、
tremendous、
enormous
n. 浩瀚；广阔无垠的空间
voluminousness