tiáo / yán / rén / yuán / tōng / guò / wèn / juàn / hé / fǎng / tán / shōu / jí / le / dà / liàng / yǒu / jià / zhí / de / xìn / xī

调研人员通过问卷和访谈收集了大量有价值的信息。

The research workers collected a great deal of valuable information through questionnaires and interviews.