3 sentences

1. 我在六英尺以内。

   wǒ zài liù yīng​chǐ yǐ​nèi.

   I am within six feet.

   Source: OpenSubtitles

2. 他身高六英尺。

   tā shēn​gāo liù yīng​chǐ.

   He is six feet tall.

   Source: Dong Chinese Dictionary

3. 这架客机正在三万英尺的高空平稳地航行。

   zhè jià kè​jī zhèng​zài sān​wàn yīng​chǐ de gāo​kōng píng​wěn de háng​xíng.

   This passenger plane is cruising smoothly at an altitude of 30,000 feet.

   Source: Dong Chinese Dictionary