2 sentences

1. 这里的每一件商品都是经过精选的。

   zhè​lǐ de měi yī jiàn shāng​pǐn dōu shì jīng​guò jīng​xuǎn de.

   Every item here has been carefully selected.

   Source: Dong Chinese Dictionary

2. 在矿石加工过程中，精选是至关重要的一步。

   zài kuàng​shí jiā​gōng guò​chéng zhōng, jīng​xuǎn shì zhì​guān​zhòng​yào de yī bù.

   In ore processing, concentration is a crucial step.

   Source: Dong Chinese Dictionary