在叶片中心有一个大的圆形空间，可以让水中生物安全通过。

And there is a large circular gap at the centre of the blades, which is safer for Marine life.

youdao

枝条顶部是半圆形，中间长出一条细长的茎，叶片又是比较宽的。

Branches at the top is a semi-circular, in the middle grow into a slender stem, leaf is relatively wide.

youdao

倒披针形的叶片，在20厘米，先端钝的或圆形。

Leaf blade oblanceolate, to 20 cm, apex obtuse or rounded.

youdao