A short, cheerful note, as that of a bird.

短而愉快之声调；鸟叫声；啾啾声；唧唧声。

To utter such a note.

发啾啾声；作唧唧声。

To talk merrily.

愉快地谈。

To utter with, or cheer up by, such a note.

啾啾叫；唧唧叫。