vitamin K↓1

例句：

1. 1.Vitamin K plays a crucial role in bone health.
   维生素K在骨骼健康中起着关键作用。
2. 2. The supplement contains vitamin K, which is essential for blood clotting.
   这种补充剂含有维生素K，对血液凝固至关重要。
3. 3. The elderly often need more vitamin K to maintain their bones.
   老年人需要更多的维生素K来维护他们的骨骼。