Such technology can be safe, even in fairly dense cities and suburbs.

即便 在高人口密度的城市和郊区，该项技术都是非常安全的。

youdao

I gather that what you want is a fairly symmetrical pattern, more dense in the middle than at the edges, probably centered a bit above the point of aim.

我想你要得到的是一个很对称的模式。中部的密度比周围大，可能集中在目标之上的某一点。

youdao

If your signup page is fairly information-dense, it may be better to try a 30 - or 40-second delay instead.

如果你的注册页信息相当密集，尝试一下用30 - 40秒钟默认延误时间来取代是更好的。

youdao