A thin funnel cloud touches down in a field in northwest Iowa.

一个细细的漏斗云接近爱荷华州西北部的一块田地。

Watch as the bolt touches down about ten feet from the youngsters.

回放中可以看见闪电离这两个小孩仅十英寸之遥。

A tornado touches down near Elie, Manitoba, Canada on June 22, 2007.

六月二十二日，龙卷风降临加拿大曼尼托巴省的艾利镇。

And once a virus touches down, sometimes all it takes is one sneeze to spread the infection throughout the community.

而一旦病毒登陆，有时只需一个小喷嚏，就能使整个社区被病毒感染。