bànlǐ / tuìpiào / shí / gōngzuò / rényuán / xiàng / tā / shuōmíng / le / jījiànfèi / de / tuìhuán / guīzé

办理退票时，工作人员向他说明了机建费的退还规则。

When he processed the ticket refund, the staff explained the rules for refunding the airport construction fee.