it is 的常用口语形式，it has 的常用口语形式，尤用于 has 用作助动词时

It's a beautiful day today.
今天是个美好的日子。
I'm sorry, I didn't catch what you said. It's a bit noisy here.
对不起，我没听清楚你说什么，这里有点吵。
It's been a long time since we last met.
自从我们上次见面以来已经很久了。
It's important to stay hydrated, so drink plenty of water.
保持水分很重要，所以要多喝水。
It's not about how hard you hit, it's about how hard you can get hit and keep moving forward.
关键不在于你打击得多重，而在于你能承受多大的打击并继续前进。
It's never too late to learn something new.
学习新东西永远不晚。
It's raining outside, remember to take an umbrella.
外面在下雨，记得带把伞。
It's a tradition in our family to celebrate Christmas together.
在我们家，一起庆祝圣诞节是一个传统。
It's a pity you couldn't come to the party.
你没能来参加聚会真是太遗憾了。
It's time for us to start thinking about the future.
我们是时候开始考虑未来了。