This is because the market interest rate of bond issuing currency is low, which leads to low bond yield. Just look at the current interest rate of the euro. For example, the latest one-year euro lending rate Libor (London Interbank Offered Rate) is about 0.5%, while the latest one-year RMB lending rate Shibor (Shanghai Interbank Offered Rate) is about 4.4%. It is also a one-year period, and the interest rates of different currencies vary greatly.