2 sentences

1. 你的观察力可真是惊人。

   nǐ de guān​chá​lì kě zhēn shì jīng​rén.

   You have amazing powers of observation.

   Source: OpenSubtitles

2. 这个找茬游戏非常考验观察力。

   zhè gè zhǎo​chá yóu​xì fēi​cháng kǎo​yàn guān​chá​lì.

   This 'spot the difference' game is a real test of observation.

   Source: Dong Chinese Dictionary