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。
Success grows out of struggles to overcome difficulties.
成功来自于克服困难的斗争。
In the first place, any scientific study requires that there be no preferential weighting of one or another of the items in the series it selects for its consideration.