“用作”的英语？

这种植物被用作治疗神经痛时的镇静药。The plant acts as a sedative in treating neuralgia.底下的空间可用作储藏区。The space underneath could be used as a storage area.除非是用作种犬，所有的母犬都应摘除卵巢。All bitches should be spayed unless being used for breeding....