穿山甲的鳞片由非常薄的棱柱形结构单元和折叠单元组成。

The scales of the pangolin were composed of the very thin prismy construction units and the folded units.

youdao

基因资料—dna和rna—链是称为核苷酸的小单元组成的序列。

Strands of genetic material - DNA and RNA - are sequences of small units called nucleotides.

youdao

基因中包含有形成蛋白质的指令，这个指令是由称作氨基酸的单元组成的。

Genes contain instructions for building proteins, which are made of units called amino acids.

youdao

Okay. So here we have a series of groups of two quarter notes.

好的,我们有好多的单元,由两个四分音符组成

耶鲁公开课 - 聆听音乐课程节选