1. Be careful when you come across hogweed in the wild, as its sap can cause skin reactions.
在野外遇到独行菜时要小心，因为它的汁液可能引起皮肤反应。

2. The local authorities are working hard to control the spread of hogweed in the area.
当地政府正在努力控制该地区独行菜的传播。