Xīnjiāng de pútao zhīsuǒyǐ tián, jiù shì yīnwèi wēnchā dà.
Xinjiang grapes are sweet precisely because of the wide temperature swing.
Tips
mistakes
The second character is read 差 here, the noun meaning difference, the same reading as in 时差 and 差距. The everyday 差, poor or lacking, is a separate reading and does not belong in this word.
usage
Always a gap between two named readings, and the modifier says which two: 昼夜温差 for day against night, 室内外温差 for inside against out. Bare, it defaults to the day's high against its low.