One hundred percent commitment to your studies, though it can be lonely and no fun at all, will leave precious marks on your youth.

百分百投入到学习中去，尽管会既孤独又无趣，但这会在你的青春里留下宝贵的印记。

youdao

Being a billionaire can be lonely.

做一个亿万富翁注定是孤独的。

youdao

Don't wait to be lonely, to recognize the value of a friend.

不要等到寂寞了，才明白朋友的价值。

youdao

It is night time. And the only sound that can be heard is the long, lonely whistle coming from the train's engine.

VOA: special.2010.06.13

So sometimes when you are living in another country, it can be very lonely.

有时候，当你在另一个城市居住的时候，难免会感到孤单。

在英语系国家 - SpeakingMax英语口语达人

He said to himself, "This will be a lonely house now."

VOA: special.2009.03.07

To be single must mean to be lonely but far lonelier are those who fear being alone.

BBC: Viewpoint: Why are couples so mean to single people?

But as Mr Brown is already discovering, and will discover more over the next few years, it can also be lonely.

ECONOMIST: Gordon Brown, the lonely chancellor

Being entrepreneurial can be lonely, especially in these days of virtual businesses, where your employees or partners are not in the same place as you are.

FORBES: How Entrepreneurs Can Beat The Holiday Blues