Diachronous
[地质]年序堆积层
🗣️ 情景例句
My computer was infected by a virus, I guess since I didn't have firewall installed.
我的电脑受到病毒感染了，我想是因为我没装防火墙。
It would help if you could try to speak a little slower.
请你尽量放慢说话速度。
Sun Huifang.
孙惠芳。