This book upset me; A troubling thought.

这本书深深感动了我；一种忧虑的想法。

youdao

I would feel very childish and ridiculous troubling the teacher with questions I could answer for myself with a little thought and by using a dictionary.

如果我拿许多经过自己略微思考、查一下词典就能得到答案的问题去麻烦老师，我会觉得这很幼稚、很荒唐。

youdao

If these are unfortunates too sick to have qualified for private health insurance, then Medicare's total spending could well rise: a troubling thought, the Republicans point out, for a system whose impending insolvency was delayed, but not eliminated, by the balanced-budget agreement.

ECONOMIST: And for his next trick