也有其不利的因子，如土地质量差、气候高寒、劳动力素质差、经济基础弱等。

It has also many disadvantageous factors such as poor land quality, frigid climate, low quality of rural Labour force, undeveloped infrastructure, etc.

神经管缺陷儿出生素质差，围产期病死率高，预后不良。

Babies with NTDs are in poor birth quality, higher perinatal mortality and poor prognosis.

农村幼教师资专业素质差，待遇低，不稳定，缺乏培训机会。

The teachers are badly qualified, their salary is low and unstable, and they lack the training opportunities.

她也说：“在空气素质差的那一天待在室内的效果不大。”

Staying indoors on a day when the air is particularly bad accomplishes little, Dora said.

提高劳动力素质和生产能力。

Improving the quality and productivity of the work force.