guān chá / shuǐ dào / shí / xué shēng / fā xiàn / yè qiào / bāo guǒ / zhe / jīng / de / yí bù fen

观察水稻时，学生发现叶鞘包裹着茎的一部分。

While observing the rice plants, the students found that the leaf sheaths wrapped around part of the stems.