A long, narrow tufted cirrus cloud, the first indication of an approaching warm front.

马尾云(狭长成簇的卷云，为暖锋将至的征兆)。

Aquatic plant (Hippuris Vulgaris) with dense whorls of tapering leaves.

杉叶藻(水生植物，有浓密环生的带状叶)。