We have two periods of geography per week.

我们每星期有两节地理课。

The study identified two periods of diversification among angiosperms.

该研究确定了被子植物的两个多样化时期。

Tonight should be maths lesson for two periods and Luca didn't show up, so he missed all two lessons tonight.

今晚有两节数学课，但是卢卡都没来，他逃了今晚的两节数学课。

Kiersten Brydie has lived at home during two periods of her adulthood.

Kiersten Brydie 在成年后的两次时期都住在家里。

Paleogene, the two periods whose boundary is marked by this event.

古近纪的德语缩写之后，这两个时期的边界 以该事件为标志。

The rest of " Little Women" zigzags between two periods in the lives of Jo and her family.

“小妇人” 的其余部分在乔和她的家人生活的两个时期之间曲折。

These two periods in British history were so important that they are known as the Agricultural and Industrial Revolutions.

英国历史上的这两个时期非常重要，因此被称为农业革命和工业革命。

The vocabulary, your studies are organized into periods either semesters if you have two periods per year, or trimesters or terms if you have three periods per year.

看看词汇，你的学习被分成几个阶段，如果你每年有两个阶段，就分为上下学期，如果你每年有三个阶段，就分为三学期制或学期。

There were actually two periods of rain and lake formation: the first one began about 37000 years ago;and the second one dates from about 10000 years ago.

雨水和湖泊的形成实际上有两个时期：第一个时期大约在37000年前开始；第二个时期大约在10000年前。

" And there are a lot of debates about how the two periods related to each other, but we lacked the evidence in the area I'm most interested in, which is the Mekong Valley."

“对于两个时期的彼此关联方式存在大量争论，但我们缺少我最感兴趣的这个地区——湄公河流域——的证据。”

In a way, you know, if you think about your life generally, it's bracketed by these two periods where you're likely not making that much - when you're very young and when you're very old.

德赛：在某种程度上， 你知道，如果你从总体上考虑你的生活，你会发现这两个时期你可能赚不到那么多——当你很年轻的时候和当你很老的时候。