The impact of raindrops on the loose soil tends to transfer fine clay particles into the tiniest soil spaces, sealing them and producing a surface that allows very little water penetration.
Kenya has one of the highest rates of mobile-phone penetration in Africa, and, dominated by M-PESA, by far the biggest network of mobile-phone-based money transfer.
在非洲，肯尼亚拥有最高的手机拥有率，而且，由M - PESA技术主导，目前覆盖最广泛的手机钱包。
3
Intermolecular electron transfer, which is known to play usually a dominant role in photoelectric conversion processes, is regarded as an electronic intermolecular barrier penetration process.