Melaniidae
黑螺科
??? 情景例句
Good morning, Mom.
早安 ，媽媽。
How long does it take for a letter to get to California ?
一封信到加利福尼亞要花多長時間？
If, at the time, the British had not feared invasion, it would have been completed.
如果不是因為那時英國人害怕入侵，隧道早已建成了。