The bookstore is across from the supermarket.
"Across from"是一种常见的表示"在...对面"的说法。其来源是英文"across"和"from"两个单词组合而成，"across"表示"横过"，"from"表示"从...来"。
例句：
The park is across from the pbrary. (公园在图书馆对面。)
The post office is across from the bank. (邮局在银行对面。)
The museum is across from the city hall. (博物馆在市政厅对面。)