A gale was blowing and the sea was choppy.

大风吹来，海面上碧波荡漾。

《柯林斯英汉双解大词典》

Like a massive sailboat pivoting 180 degrees in choppy seas, this wrenching turnaround produced a massive wake, and induced nausea among many of its passengers.

就像一艘大船在波涛汹涌的海上来了个180度的转弯，这惊心动魄的转变大声唤醒了人们，有些乘客禁不住感觉恶心了。

youdao

All these events toss the mind like a boat on a choppy ocean.

所有这些折磨着脑袋，就如小船在大洋风浪中般无助。

youdao

It could be a little choppy, it could be uneven, and it is going to take a while,".

VOA: standard.2009.11.01

Their Call of Duty 2 demo was a little choppy, which is a little unexpected.

ENGADGET: & Joystiq's live coverage of Microsoft's Xbox 360 E3 event

Trading remains choppy on a day-to-day basis but the bulls still enjoy the overall technical advantage.

FORBES: Comex Gold Firmer as Trading Remains Choppy; Bull Still Have Technical Advantage

Technically, trading in the gold market has turned choppy on a daily chart basis.

FORBES: A.M. Kitco Metals Roundup: Gold Weaker amid Bearish Outside Market Forces