单个的英文：
single
solitary
odd
solo

参考例句：

A tsunami is not just a wave, but a wave train.
海啸不是单个波，而是一列波。

Similar circumstances only arise within a single historical period.
类似条件仅出现于单个历史时期内。

The control by a single gene of several distinct and seemingly unrelated phenotypic effects.
多效作用受具有若干独特的、看似与表现效果不相关的单个基因的控制

All the alkali metals have a single s-electron outside a closed shell
所有的碱金属都在闭合壳层之外有一单个S电子。

Because many records can be storedon a single disk, a great deal of data can be processed in this limited space
又因为许多记录能存在单个磁盘上，所以大量的数据可在一个有限的空间内被处理。

Use single window for viewing messages
使用单个窗口来查看消息

Some of the statues stand alone, while others are grouped.
这些塑像有单个的，也有成群的。

The single word gloss was usually interlined
对单个词的注释还常用间注法。

"azygous:Occurring singly; not one of a pair, as a vein or muscle."
不成对的:单个存在;而非一对中单个的,如静脉或肌肉。

No single molecule has the sole prerogative of growth regulation
没有一种单个的分子具有调节生长的唯一特权。

single是什么意思：
adj. 单一的；个别的；单身的；单程的 n.单曲唱片；单程票；单打比赛
v.挑出，选出；击出一垒安打

They single out the biggest apple.
他们挑出最大的苹果。

They play single this afternoon.
他们今天下午进行单打比赛。

A single to London, please.
劳驾，一张去伦敦的单程票。

solitary是什么意思：
adj. 孤独的，独居的；肚子的；唯一的
n. 独居的

a solitary retreat.
隐居处

There was the solitary flat marsh on the shore.
岸上是一片荒凉萧索的沼地。

Nixon was solitary and chronically suspicious.
尼克松为人孤僻，一向疑心很大。

odd是什么意思：
adj. 奇怪的；不规律的；各种各样的；不成对的，奇数的；临时的
n. 机会；怪人；优势

What are the odds?
成功的几率是多少？

But that is an odd statement.
但是，这是个古怪的陈述。

3 is an odd number.
3是一个奇数数字。