And without the facts about those feelings, an otherwise happy couple can become very unhappy as the events of lifechange.
如果没有关于情感的这些事实保障，随着生活的变化，在其他方面很愉快的伴侣也能变得非常不愉快。
3
Understanding how nature responds to climate change will require monitoring key life cycle events - flowering, the appearance of leaves, and the first frog calls of the spring - all around the world.