Now, the signature whistle is a whistle that's specific to an individual dolphin, and it's like a name.  And this is the best-studied sound, because it's easy to measure, really, and you'd find this whistle when mothers and calves are reuniting, for example.
シグネチャーホイッスルと呼ばれる鳴き方は 個体に固有の鳴き方で 名前のようなものです  これは最もよく研究されている鳴き声です 測定しやすく たとえば 子イルカが母イルカの元に戻るときに 聞くことができます