英语语法分析

It took shorter time for the hypoplastic enamel powder to attain an equilibrium than the normal did.

溶解度研究发现发育不全的釉质溶解度大，且达到平衡的时间短。

Aortic atresia is not compatible with continued survival as seen in hypoplastic left heart syndrome.

发育不全左心综合症造成的主动脉闭锁患者一般不能生存。

Objective: To evaluate the efficacy of Norwood procedure for treating hypoplastic left-heart syndrome (HLHS).

目的：探讨诺伍德手术治疗左心发育不全综合征的方法和疗效。