This results in alternating periods of quiescence and activity - remarkably like the build-up and collapse of a sand pile.
这会导致变换的静止和活动的周期-与沙堆的堆砌和崩塌非常相像。
2
If you come up with activities like playing board games, or going to an art class, or any activity that allows on-to-one communication, you build your relationship.
如果你采用的是玩棋类游戏、或者参加艺术课程、或者任何允许一对一交流的活动的话，那么你就会创建联系。
3
But the gradual build-up of underground pressure can lead to occasional bursts of cataclysmic activity.