You will feel more buoyant and optimistic about the future than you have for a long time.

对于未来，你会比很久以来所感受到的更加快活、乐观。

We have a buoyant economy and unemployment is considerably lower than the regional average.

我们的经济繁荣，失业率远远低于区域平均值。

While there is still sufficient trapped air within the container to keep it buoyant, it will float.

只要容器中仍然有足够的空气，它就能漂浮。