When drive-ins were at the height of their popularity in the late 1950s, some 4,000 existed in the United States, but today there are less than one-quarter that many.
there are less than one-quarter that many
there are fewer than one-quarter as many
there are fewer than one-quarter of that amount
the number is less than one-quarter the amount
it is less than one-quarter of that amount
drive-in n. 免下车餐馆,免下车电影院 drive-ins 是复数了...
at the height of sth 在sth的鼎盛时期
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