I feel giddy, I need to sit down.

我觉得头晕，我需要坐下来。

youdao

Do I need to sit in an assigned seat?

我需要坐在指定的座位吗？

youdao

I need to sit down. I have a splitting headache.

我要坐下，我觉得我的头快爆炸了。

youdao

I need you to sit down, relax and tell me what the problem is.

我需要你坐下，放松，告诉我问题在哪里。

You look 实战 - SpeakingMax英语口语达人

But I think we need to sit down and say what can we do to actually drive this forward and open it up to small businesses and give them the ability to get finance and grow the business.

BBC: Northern Ireland's business angels who act like dragons

What I need mainly are sitters, people to sit with Pete while Catrin and I can go out and do things.

BBC: RELATED BBC SITES

You going to sit back, maybe do a little barbecuing, looking over and say I need a tomato patch or something right there.

NPR: Vegetable Gardening On A Budget