心脏舒张

例句：

1. 1. The heart slowly expanded as he recovered from the surgery.
   随着他从手术中恢复，心脏慢慢扩张。
2. 2. The lungs gradually expanded to accommodate more air.
   肺部逐渐扩张以容纳更多的空气。
3. 3. During the expansion phase, the plant grows taller and stronger.
   在扩张阶段，植物长得更高更强壮。