这是一次很有价值的访问。

[误] It was a worth while visit.

[正] It was a worthwhile visit.

注：worth while 即 worth one\'s while，意思是“做......是值得的”，其一般句型是 it is worth while doing sth.。

worthwhile，即“值得的”之意：a worthwhile experiment(一项值得做的实验)。本句中 worthwhile 作定语修饰 visit，故不能分开写。