tā / běn / lái / xiǎng / àn / jì / huà / chū / fā / zěn / nài / tū / rán / xià / qǐ / le / dà / yǔ

他本来想按计划出发，怎奈突然下起了大雨。

He had planned to set off, but alas, it suddenly began to rain heavily.