我们认定，在只知道野天鹅的现状，没有搞清楚我们究竟能为它们做点什么之前就拿它们做实验太危险了。

We decided that, given the trumpeters' status, experimentation with them would BE too risky until we knew what we were doing.

youdao

我们认定，在只知道野天鹅的现状，没有搞清楚我们究竟能为它们做点什么之前就拿它们做实验太危险了。

We decided that, given the trumpeters' status, experimentation with them would BE too risky until we knew what we were doing.

youdao