3 sentences

1. 内在美比外在的容貌更重要。

   nèi​zài měi bǐ wài​zài de róng​mào gèng zhòng​yào.

   Inner beauty is more important than outward appearance.

   Source: Dong Chinese Dictionary

2. 虽然外在美很重要，但内在修养更关键。

   suī​rán wài​zài měi hěn zhòng​yào, dàn nèi​zài xiū​yǎng gèng guān​jiàn.

   While outward beauty is important, inner cultivation is more crucial.

   Source: Dong Chinese Dictionary

3. 这种学习动力主要来自奖励等外在因素。

   zhè zhǒng xué​xí dòng​lì zhǔ​yào lái​zì jiǎng​lì děng wài​zài yīn​sù.

   This motivation for learning mainly comes from external factors such as rewards.

   Source: Dong Chinese Dictionary