英语语法分析

Preimplantation genetic diagnosis.

胚胎植入前的诊断。

A technique already in use is called preimplantation genetic diagnosis (PGD).

目前已经应用的一项技术叫做植入前基因诊断(PGD)。

Preimplantation development of reconstructed embryos by nuclear transfer was studied.

小鼠体细胞核移植重构胚的着床前发育情况。