1.
This region falls roughly into four great divisions.
这个地区大体上可分为四个大分区。
2.
Smaller molecules pass through these membranes more easily than larger ones, allowing separation based on molecular size.
小分子要比大分子更易通过膜,因此分离是依据分子的大小
3.
A blastomere of intermediate size, larger than a micromere but smaller than a macromere.
中分裂球中等尺寸的分裂球，大于小分裂球而小于大分裂球
4.
There does not look much difference between them at a distance.
从远处看，没有多大分别。
5.
a fraction whose numerator is larger than the denominator.
分子大于分母的分数。
6.
fall into two main groups
归为两大组，分为两大类
7.
(4) Most of northeastern China;
四、东北的大部分；
8.
give portions of(food)to several people
把（食物）分给大家
9.
It's about eight thirty
大约是8 点30 分。
10.
No, it is about two minutes slow.
不，它大概慢两分。
11.
About a ten minutes'walk.
大概10分钟行程。
12.
rude classification [ estimates ]
大致的分类[估计]
13.
partitioning n.
[港台] 分段法；区分法；[大陆] 分块；划分
14.
case-sensitive:Capable of distinguishing between uppercase and lowercase letters.
区分大小写：能够区分大写和小写字母。
15.
a major portion (a majority) of the population; Ursa Major; a major portion of the winnings.
大部分（大多数）人口；大熊星座；成功的大半。
16.
The classic form of this Daqu was divided into three major parts, and each part consisted of a certain number of sections.
典型的大曲分为二大部分，每部分包括若干段。
17.
Classification of membrane separations is based primarily on molecular size.
膜分离的分类基本依据是分子大小。
18.
The molecular separator is present to remove most of the carrier gas.
分子分离器可除去绝大部分载气。