The invention of the telegraph was one of the precursors of modern communication.

电报的发明是现代通信的先驱之一。

Gray and Burns were precursors of the Romantic movement in English Literature.

格雷和伯恩斯是英国文学浪漫主义运动的先驱.

Minoru and his father Friedemann Freund, also from Nasa Ames Research Center, developed the scientific theory behind these earthquake precursors.

明纳路和他同是美国宇航局埃姆斯研究中心工作人员的父亲弗来德蔓弗洛伊德根据这些地震“先驱”建立了这套科学理论。

The dark clouds were precursors of the coming storm.

乌云是即将到来的暴风雨的前兆。

Certain chemicals act as precursors to more complex compounds.

某些化学物质是更复杂化合物的前兆。

The early symptoms can be precursors to a more serious illness.

早期症状可能是更严重疾病的前兆。

The precursors are tobacco alkaloids, nitrate and nitrite.

它们形成的前体物是烟草生物碱 、 硝酸盐和亚硝酸盐.

For precursors, confidence would come from empirical observations;

对前兆来讲，信心来自经验主义的观察；

The chemicals include deadly pesticides and their even deadlier precursors.

这些化学品包括一些能致人死地的农药成品以及危害相当的制作原料。

Note the presence of megakaryocytes, erythroid islands, and granulocytic precursors.

可见巨核细胞, 红细胞岛和粒细胞前体细胞.