But important questions remain, he says. For example, male humpback whales sometimes sing as they move in and out of competitive groups, but researchers don't know what role the songs play in mating.

但重要的问题还是，他说，比如，雄性驼背鲸有时候在进入或离开一个竞争性群体时唱歌，但研究者不清楚唱歌在其中起什么作用。

youdao

Three broad groups stand out.

存在三大主要集团。

youdao

But industry groups point out that gas looks attractive compared to the alternatives.

不过，业界团体认为比起其他可替代能源，天然气还是蛮有吸引力的。

youdao

The news media and self-appointed ethics "watchdog" groups observe how lobbying is carried out.

VOA: special.2010.09.27

So, defeated political groups might well -or individuals who were the heads of those groups might decide they have to get out of town.

所以,政治上失利的一方,或者这方的领导人,会做出决定,离开城市

耶鲁公开课 - 古希腊历史简介课程节选

Cultural groups that found effective ways to bind non-kin together out-competed groups that were less cohesive.

CNN: Why we love to lose ourselves in religion

Chilled-out groups chat and drink at umbrella tables, looking out to the river as cruise-liners pass by the Chelsea Piers.

BBC: Walking New York City��s High Line

Each has expertise (in my mind) in different areas and I reach out to sub-groups with relevant and pertinent questions.

FORBES: Build an Advisory Board For Your Life