Remittance channels can be used to sell these bonds to migrants because when they come on a monthly basis to send remittances, that's when you can actually sell it to them.
可以通过移民汇款的渠道， 把这些债券卖给移民， 因为他们 每个月来寄钱的时候， 就正好是可以向他们出售债券的时候。