fact of life

例句：

1. 1.The fact of life is that we all have to work hard to achieve our goals.
   事实是，我们都必须努力工作才能实现我们的目标。
2. 2. Life is a fact of life, and we must learn to adapt to it.
   生活是生活的现实，我们必须学会适应它。
3. 3. The fact of life is that we all face challenges and obstacles in our lives.
   生活的真相是，我们所有人都在生活中面临挑战和障碍。