1 sentence

1. 当出生率上升，死亡率下降时，人口就会增加。

   dāng chū​shēng​lǜ shàng​shēng, sǐ​wáng​lǜ xià​jiàng shí, rén​kǒu jiù huì zēng​jiā.

   When the birth -rate increases and the death rate drops, the population increases.

   Source: UM-Corpus: Education