Actual billed rates may vary due to currency exchange fluctuations. 实际费率会根据货币汇率波动而有所变更。
You lock in today's exchange rate instead of a volatile currency exchange rate in the future that could significantly devalue your purchasing power. 你锁定今天的汇率,避免了将来可能会极大地降低你的购买力的货币汇率波动。