pay a visit to 人和地点都可以；
drop in on sb；drop in at 地点place，都是拜访的意思。
例句
She must pay a visit to her grandmother.
她必须去探望她的祖母。
When can they pay a visit to the headmaster?
他们什么时分能访问校长？
We should pay a visit to the hospital tomorrow.
我们明天应该去医院看他一趟。
水利万物而不争,
而万物莫能与之争。
