The school year is divided into three trimesters.
一学年分三个学期。
A pregnancy is divided into three phases, or trimesters.
怀孕可以分成三个阶段，也可以说三期。
There are three 15 week trimesters commencing in January, May and September respectively. Not all subjects are offered in each trimester. Most subjects are offered once per year.
有三个学期(每个学期为期15周)，开课时间分别为一月，五月和九月。不是所有的课程每个学期都开设。大部分课程每年仅开设一次。
There are three 15 week trimesters commencing in January, May and September respectively. Not all subjects are offered in each trimester. Most subjects are offered once per year.
有三个学期(每个学期为期15周)，开课时间分别为一月，五月和九月。不是所有的课程每个学期都开设。大部分课程每年仅开设一次。
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