Although impure liquid hydrazine doesn't explode, it can certainly boil vigorously and spray hot and chemically toxic liquid around, which can endanger the safety of people nearby.

不纯的液肼虽然不会爆炸，但肯定会剧烈沸腾，并向周围喷出炽热的化学毒性液体，危及附近人员的安全。