Business is a competitive activity. It is very fierce and very unforgiving.

商业是一种竞争性强的活动：很残酷，也不允许任何错误。

《柯林斯英汉双解大词典》

A family here has a very fierce dog, and everyone is scared when they see it.

这里有一家人养了一只很凶的狗，人人见了都害怕。

youdao

The dog outside belongs to the owner of the house. It is very fierce.

外面那条狗是这个房子的主人的。它很凶。

youdao

But very soon, the battle would become fierce.

VOA: special.2009.08.27

What starts out looking very benign, once you look closer, is pretty fierce and filled with violence, and that's why people want to leave.

乍一看非常良善，一旦仔细看，会发现它粗暴且充满暴力，而这就是人们想脱离的原因。

耶鲁公开课 - 公正课程节选

Now Durham, because of what he's done in the past - he's known as a very fierce investigator.

NPR: Federal Prosecutor Named to CIA Probe

There's this huge bubble passing through the anaconda here, this bulge, and so the competition is very, very fierce.

NPR: Ask Amy: Responding to the Thin Envelope

"The competition is very fierce here, " says Andrew Yeung of Harbour City, which spent several hundred thousand dollars to host the duck.

WSJ: In Hong Kong, Giant Duck Makes a Splash