✔ 最佳答案
while和when都可以用作”當”,如:
when/while I was watching television, the telephone rang.
但while只帶出兩者時間比較長的動作,而when則可帶出長時間或短時間的動作,如上述的句子就不可改為
I was watching television, while the telephone rang.(因為telephone rang的時間比watching television短)
但句子卻可改為
I was watching television, when the telephone rang.
希望幫到你!