English has a large vocabulary with different usages so it's not easy for a Chinese person to speak English as fluently as a native speaker.

英语词汇量很大，用法也很多，所以一个中国人想把英语说的像母语者一样流利并不容易。

youdao

She has not had an easy life.

她不曾有过舒适的生活。

《柯林斯英汉双解大词典》

He says it's not easy to convince people that nutria fur is green, but he has no doubt about it.

他说，让人们相信海狸鼠的毛是绿色的并不容易，但他对此毫不怀疑。

youdao

It has easy appeal for the bully because it does not involve face-to-face contact and it can be done at any time.

VOA: special.2010.04.22

But preparing the captive bred condors to live in the wild again has not been easy.

VOA: special.2009.11.18

Recovery has not been easy despite international donations.

VOA: standard.2010.01.02

Integrating migrants into what, for all Italy's divisions, was previously an ethnically uniform society has not been easy, but it has gone better than expected.

ECONOMIST: The world comes to Italy

But the way has not been easy, and Moto Guzzi has been bought and sold like a mule over the decades, even spending a stretch in government receivership.

WSJ: 2014 Moto Guzzi California 1400 Touring ABS Review: Ponch, Your Ride Is Here | Rumble Seat by Dan Neil

It has not been easy, but at least we are all together, and that is priceless.

FORBES: Connect