2 sentences

1. 有时很难判断一只小狗是否完全长大。

   yǒu​shí hěn nán pàn​duàn yī zhī xiǎo​gǒu shì​fǒu wán​quán zhǎng dà.

   Sometimes it's difficult to judge whether a puppy is fully grown.

   Source: CCMatrix

2. 每一棵树都是从一粒种子长起来的，变成树苗，最终发展成为一棵完全长成的树。

   měi yī kē shù dōu shì cóng yī lì zhǒng​zi zhǎng qǐ lai de, biàn​chéng shù​miáo, zuì​zhōng fā​zhǎn chéng​wéi yī kē wán​quán zhǎng​chéng de shù.

   Every tree grows from a seed, becomes a sapling and eventually develops into a fully-grown tree.

   Source: CCMatrix