swell of a mould

例句：

1. 1. The population of the city swelled with the arrival of tourists.
   随着游客的到来，这座城市的人口激增。
2. 2. The economy swelled after the government implemented a new tax policy.
   在政府实施新的税收政策后，经济迅速增长。
3. 3. The waves swelled as the wind picked up.
   风力增强时，海浪汹涌澎湃。