将“trimester"翻译成中文

Specific themes were defined for each grade and are further developed each trimester.

针对各年级定义了特定主题,并在每学期(三个月)更换新的主题。

Generally most women visit a health facility during their second trimester.

一般而言,大部分妇女在怀孕到第二个三个月期间前往保健设施就诊。