bag of cement的用法和樣例：
例句
- The sack of cement hit the ground with a thump.
水泥袋砰的一聲落在地上。 - Unfazed by the absence of gyms in backwoods Mississippi, he made late night forays to the junkyard and jerry-rigged his own gym with old pulleys and bags of concrete.
他沒有因為不能去偏僻森林地帶的密西西比的體育館感到憂慮，他深夜去到垃圾堆，用舊滑輪和水泥袋，不正規地進行他自己的體育訓練。
