Because it's boring
无聊───boring;那───that
The summer days wore on and life returned to its boring routine.───夏天的时光已经流逝，生活又恢复了昔日的无聊。
His speeches are boring.───他的演讲单调乏味.
The phony glamour of night clubs soon became stale and boring.───夜总会那种虚荣的繁华不久便失去了新意而使人生厌.
He is a boring person.───他是个令人讨厌的人.
Exercising alone can be boring.───独自一个人锻炼可能会很无聊。
Obsessives, in any area, are invariably as boring as their hobbies.───无论在哪个领域，过分痴迷者都会跟他们的癖好一样令人厌烦。
His poems sound dead boring, actually.───实际上，他的诗听起来非常乏味。
Instead of going to work thinking that it will be totally boring, try to be positive.───不要一边去上班一边想着工作太无聊，要积极一些。
Even the most boring times in life are limited.
Many diets fail because they are boring.
I found this novel boring.
In life, then boring time, also are limited edition.
"Am I boring you?" she asked anxiously.