Diachronous
[地質]年序堆積層
??? 情景例句
My computer was infected by a virus, I guess since I didn't have firewall installed.
我的電腦受到病毒感染了，我想是因為我沒裝防火墻。
It would help if you could try to speak a little slower.
請你盡量放慢說話速度。
Sun Huifang.
孫惠芳。