4 sentences

1. 赛道上现在只有一个骑手。

   sài​dào shang xiàn​zài zhǐ​yǒu yī​ge qí​shǒu.

   There's only one rider out on the course now.

   Source: OpenSubtitles

2. 赛道附近没有树木或天然的障碍物。

   sài​dào fù​jìn méi​yǒu shù​mù huò tiān​rán de zhàng'ài​wù.

   There are no trees or natural obstacles near the track.

   Source: CCMatrix

3. 芝加哥马拉松以其快速平坦的赛道而闻名。

   zhī​jiā​gē mǎ​lā​sōng yǐ qí kuài​sù píng​tǎn de sài​dào ér wén​míng.

   The Chicago Marathon is known for its flat and fast course.

   Source: CCMatrix

4. 我的朋友和家人也帮助重建了我的信心，我成功地重返赛道。

   wǒ​de péng​you hé jiā​rén yě bāng​zhù chóng​jiàn le wǒ​de xìn​xīn, wǒ chéng​gōng de chóng​fǎn sài​dào.

   My friends and family also helped rebuild my confidence and I successfully returned to the track.

   Source: CCMatrix