Latin culture had not achieved comparable penetration of the less urbanized West outside of Italy.
拉丁文化在意大利以外城市化程度较低的西部地区还没有达到类似的普及程度。
2
In these places, adoption of credit cards was initially much slower. It took until the 1990s to reach anything like the percentage market-penetration levels achieved in the US, Canada, or UK.
This paper presents following research result that the penetration ratio (depth to caliber) up to 10 has been achieved by using the precision shaped charge warhead technology.