During the first weeks of basic training recruits are not permitted to walk out.
周的基本训练时间内，新兵不得请假外出。
Most of that improvement seemed to happen during the first four weeks.
而改善通常发生在服用镇定剂的前四周。
Fresh concrete gains strength most rapidly during the first few days and weeks.
新拌混凝土在开始几天和几周时间内强度增长很快。
During the first few weeks most individuals are fascinated by the new.
在最初的几个星期，大多数人都被新鲜感感到着迷。
The soil must not be overwatered, especially during the first few weeks.
切忌土壤过涝，尤其在最初几周。
During the first 20 weeks of pregnancy the virus can cause miscarriage.
在首20周的妊娠该病毒可导致流产。
The colostrum gradually changes to mature milk during the first two weeks after birth.
产后两周内，初乳逐渐变成熟乳。
The colostrum gradually changes to mature milk during the first two weeks after birth.
产后两周内，初乳逐渐变成熟乳。
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