In the first, male competition and intrasexual selection produce relatively short, simple songs used mainly in territorial behavior.

在第一种情况下，雄性竞争和性内选择产生相对简短的鸣声，主要用于地盘行为。

youdao

Greetings and sing some simple songs.

问候并并唱一些儿歌。

youdao

Being able to understand the main contents of simple songs and rhymes.

能听懂简易歌谣和韵文的主要内容。

youdao

So she was able to teach herself only a few simple songs.

VOA: special.2009.01.18

The songs were simple and easy to understand.

VOA: special.2009.05.11

Her songs tell simple but poetic stories.

VOA: special.2010.05.28

" Already, these social bots are being used on an experimental basis to teach various skills to preschool children, "including the names of colors, new vocabulary words and simple songs.

ENGADGET: blogger-avatar

All but one of the songs are simple, and most are giddy, which isn't to say they're unremittingly cheerful.

NPR: The Klezmatics: 'Happy Joyous Hanukah'

The songs are simple, the hooks strong, the arrangements clever and fun.

NPR: Dengue Fever Seeks 'Venus on Earth'