Qì / xiàng / kè / shàng / lǎo / shī / dài / wǒ / men / guān / chá / céng / yún / de / xíng / chéng / guò / chéng

气象课上，老师带我们观察层云的形成过程。

In meteorology class, the teacher had us observe how stratus clouds form.