1. The precursor of the modern car was a horseless carriage with a petrol engine. 现代汽车的前身是不用马拉的，装有汽油发动机的车子。
2. These precursor cells normally go on to produce red cells, white cells or platelets. 这些前体细胞通常继续发育，生成红细胞、白细胞或血小板。
3. An energetic middle life is, I think, the only safe precursor of a vitally happy old age. 我认为精力旺盛的中年时期是充满生气的幸福晚年的唯一可靠预兆。
英英解释
n.
1. a substance from which another substance is formed (especially by a metabolic reaction)
2. a person who goes before or announces the coming of another
3. an indication of the approach of something or someone
