1. The veterinarian will ovariectomize the cat to prevent unwanted pregnancies.
兽医将对猫进行卵巢切除术以防止意外怀孕。

2. The decision to ovariectomize the dog was made to reduce the risk of certain reproductive diseases.
决定对狗进行卵巢切除是为了减少某些生殖疾病的风险。