在开发新客户的同时，不定期的跟老客户沟通，登门拜访这些或许事情很小，但

在开发新客户的同时，不定期的跟老客户沟通，登门拜访这些或许事情很小，但是作用很大。

結果 (英文) 1:

Develop new customers at the same time, from time to time to communicate with the old customers to visit perhaps a small thing, but play a significant role.

結果 (英文) 2:

In the development of new customers at the same time, not to communicate with customers on a regular basis, knocking on these things is very small, but very large.

結果 (英文) 3:

While developing new customer, non-periodical with the old communication with customer, pays a visit these matter is very perhaps small, but affects is very big.