训练幼犬最有用也最重要的工具之一，是一条两端有环的绳子。

One of the most useful and important accessories for training a young dog is a piece of cord with a loop at each end.

youdao

训练幼犬最有用也最重要的工具之一，是一条两端有环的绳子。

One of the most useful and important accessories for training a young dog is a piece of cord with a loop at each end.

youdao