序幕

1.At 8:30 a.m, the 4th CAMC Track and Field Meets begins with the orgulous athelete military march.

30分CAMC第四届田径运动会开始，大会在雄壮的运动员进行曲中拉开序幕。

2.It undrew the prelude of transgenic breeding that the company of Monsanto Company obtained the first transgenic tobacco plant which had resistance to tobacco virus by transgenic technique in 1986.

1986年美国孟山都公司利用转基因技术获得第一株抗病毒病的转基因烟草植株，拉开转基因育种的序幕。