This helps them judge if they are close to dangerous water passages.

这有助于它们判断自己是否靠近危险的水道。

It's positioned directly adjacent to this — the Bosphorus Strait, a narrow water passage that divides Europe from Asia and connects the Black Sea with the Aegean and Mediterranean.

它与博斯普鲁斯海峡直接相邻，博斯普鲁斯海峡是一条狭窄的水道，将欧洲和亚洲分开，连接黑海、爱琴海和地中海。