How should I understand the underlined?
Thanks in advance.
The (Chinese) government has made small adjustments to the (one-child) policy (notably by allowing an only child who is married to another only child to have more than one child) and may adapt it further.
But for now it is firmly in place, and very low fertility rates still prevail, especially in the richest parts of the country. Shanghai reported fertility of just 0.6 in 2010-probably the lowest level anywhere in the world. According to the UN's population division, the nationwide fertility rate will continue to decline, reaching 1.51 in 2015-20. In contrast, America's fertility rate is 2.08 and rising.
'But until the policy is changed it must be strictly adhered to.'