date of production 基本例句 出厂日期 Conclusions It is of great value to improve the confirmation of the pregnant rat gestation and accuracy of the date of production by palpation and observation combined with computation method. 结论在推算法的前提下，结合触诊法、观察法进行综合判断，对提高孕鼠妊娠期的确定和分娩时间的准确性有重要的价值。 cnki