The boy surrendered the catapult to the teacher.那孩子把弹弓交给了老师.He fitted a pebble into the catapult and pulled back the elastic. Twang!他把石子放进弹弓里，然后往回拉动橡皮筋。“嘣”！The sting of the catapult bullet had worn off.挨的那下弹弓不那么疼啦....
The preparation of hypoeutectic Al - Si alloy billets for semisolid forming by low temperature casting was studied.研究了低温铸造法制备亚共晶 铝硅 合金半固态成形用坯料.He is sick and has been casting up all night.他病了，夜里一直在呕吐。In the case of rimmi...