1. The leaves of this plant are parallel-veined, which is a characteristic of monocots.
这种植物的叶子呈平行脉，这是一种单子叶植物的特征。

2. Oak trees have net-veined leaves, while grasses have parallel-veined leaves.
橡树有网状脉络的叶子，而草类植物有平行脉络的叶子。