And the fact that, over time, a growing number of the crows reacted to the "dangerous" masks suggests that flock mates learn from each other.

同时事实是，随着时间推移，能够辨识“危险”面具的乌鸦数量在增长，这说明乌鸦群体在互相学习这一信息。

youdao

The number of dangerous mistakes we have made before and since the outbreak of war because we do not understand the opponent with whom we are faced is appalling.

由于我们不认识摆在我们面前的对手，战前和战争爆发以来我们所犯危险错误的数量是骇人的。

youdao

Unfortunately, this strategy is dangerous on a number of counts.

遗憾的是，从许多方面来讲，这都是一个危险的战略。

youdao

The collateral could be a number of things including mortgages--securitized mortgages that are risky and dangerous assets.

抵押品可是很多种东西,包括抵押贷款-证券化按揭贷款,这种有风险的，危险的资产。

耶鲁公开课 - 金融市场课程节选

Unfortunately, this strategy is dangerous on a number of counts.

ECONOMIST: China and America

Poor discipline had resulted in the world champions being reduced to 14 in their previous two Tests against New Zealand, and in Brisbane they saw yellow as early as the third minute when centre Fourie was sin-binned for a dangerous tackle on number eight Richard Brown.

BBC: Australia 30-13 South Africa

Measles is potentially dangerous in a very small number of cases - it can lead to pneumonia or brain swelling.

BBC: Measles outbreak gathers pace