buoyant

尽管遇到困难，她依然保持着乐观开朗的心态。

Despite the challenges, she maintained a ___buoyant attitude.

塑料瓶在水里很轻，所以能浮起来。

Plastic bottles are ___buoyant in water because they are lightweight.

尽管面临通货膨胀压力，房地产市场依然保持活跃。

Despite inflationary pressures, the real estate market remains ___buoyant.