However, given the high uncertainty margins for the maternal mortality ratio, determining whether there is any real decline at all is difficult (2).
但是由于孕产妇死亡率也存在很高的不确定性，所以很难阐明是否真正有所降低[2]。
The purpose of the present paper is using the nonlinearization approach to study the explicit finite-parameter solution to the difficult (2+1) dimensional soliton equation.
本文主要是用非线性化方法来研究困难的（2+1）维孤子方程的显式的有限参数解的。
The purpose of the present paper is using the nonlinearization approach to study the explicit finite-parameter solution to the difficult (2+1) dimensional soliton equation.
本文主要是用非线性化方法来研究困难的（2+1）维孤子方程的显式的有限参数解的。
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