nóng / mín / guān / chá / tǔ / xù / qíng / kuàng / yǐ / jué / dìng / zuì / jiā / cǎi / zhāi / shí / jiān

农民观察吐絮情况，以决定最佳采摘时间。

Farmers observe the cotton's opening process to determine the best time to pick it.