Sixth grader Sydney Lane-Ryer said her team focused on the decreasing oyster population in the nearby Chesapeake Bay.

来自悉尼6年级的莱恩·雷耶尔表示她的团队重点关注切萨皮克湾附近急剧下降的牡蛎数量。

In some countries, birth rates are on the decrease to such an extent that the authorities have to encourage young parents to have more babies by providing additional welfare programs.

在许多国家，生育率正在不断下降，以至于政府不得不鼓励年轻人生更多的孩子，并提供更好的福利待遇。