But there are still those who perform the operation, and they and other advocates defend the surgery as a useful option for dog owners facing noise complaints and possible eviction.
但手术仍在秘密进行，并且这种手术经常被狗的主人用来应对邻居的投诉和可能发生的驱赶。
2
The history and goals of this new operation could be a useful example for other countries facing similar challenges.
这项新业务的来历和目标可以为其它面临同样挑战的国家提供一个有益的范例。
3
But the unfortunate outcome of yesterday's operation underscored the formidable difficulties facing taskforces policing the treacherous waters off east Africa.