preformation

英式音标：[ˌpri:fɔ:'meɪʃən]

美式音标：[ˌprifɔ'meɪʃən]

词汇分类：遗传学词汇Genetics Glossaries,表观遗传学 Epigenetics

词义：

n.

预先形成；

英英释义

preformation[ ,pri:fɔ:'meiʃən ]

n.a theory (popular in the 18th century and now discredited) that an individual develops by simple enlargement of a tiny fully formed organism (a homunculus) that exists in the germ cell

同义词：theory of preformation

用法：

权威例句

Preformation

Cluster preformation as barrier penetrability

Organ preformation in mayapple as a mechanism for historical effects on demography.

$\alpha$ particle preformation in heavy nuclei and penetration probability

Preformation or Epigenesis?. (Book Reviews: Oogenesis. The storage of developmental information)

Extreme preformation in alpine Polygonum viviparum: an architectural and developmental analysis.

Mechanisms of metazoan germ cell specification: epigenesis and preformation

Mechanisms of germ cell specification across the metazoans: epigenesis and preformation.

Theories in early embryology: close connections between epigenesis, preformationism, and self-organization

Crown architecture of Larix laricina saplings: shoot preformation and neoformation and their relationships to shoot vigour

造句：

1. She dusted herself down and left to build her own career.

她重振旗鼓去开创自己的事业了。

来自柯林斯例句

2. Try to support each other when one of you is feeling down.

当有人觉得情绪低落时，要努力相互打气。

来自柯林斯例句

3. One of the office girls was down with the flu.

一位女职员得了流感。

来自柯林斯例句

4. Rather taken aback by such forwardness, I slammed down the phone.

如此无礼的言语让我火冒三丈，我砰的一下把电话挂了。

来自柯林斯例句

5. These will be very constrained budgets designed to get the deficit down.

这些预算旨在减少赤字，将会大大受限。

来自柯林斯例句

[ down 造句 ]