例句與造句

1. The effective cost dust content of molding sand should be determined according to time factors such as the quality of the coal dust , casting size and thickness , pouring temperature , lacing sand or unit sand , and so on
   決定型砂中的有效煤粉含量應(yīng)根據(jù)煤粉質(zhì)量的優(yōu)劣、鑄件大小和厚薄，澆注溫度、面砂或單一砂等因素。
2. It's difficult to find unit sand in a sentence. 用unit sand造句挺難的