A portion of your income payout is interest earned on your contract and a portion is the principal of the contract.
你收入的一部分来自于合同规定的收益率收益，另一部分来自于你缴纳的本金。
2
The second principal effect of aging on the skeletal system is a decrease in the rate of protein formation that results in a decreased ability to produce the organic portion of bone matrix.
第二个主要效果上的老化骨骼系统的发生率下降，其结果在蛋白质形成的生产能力下降的有机部分骨基质。
3
It is the host's responsibility to serve the guests, and at very formal banquets people do not begin to eat until the host has served a portion to the principal guest.