大多数人有时感到寂寞，但通常这种寂寞的时间仅仅在几分钟到几小时之间，这种寂寞不严重。

Sentence No. 1 Regular exercise is something like the weather — we all talk about it, but most of us tend to make an excuse for not exercising.

Sentence No. 2 Most people feel lonely sometimes, but it usually only lasts between a few minutes and a few hours. This kind of loneliness is not serious.