Minn Myint Nan Tin, with the Burmese Advocacy Center,or BAC, says keeping this melting pot from boiling over is a delicate balancing act.

VOA: standard.2010.07.22

because with such a delicate and advanced area of science,

因为这部分的科学实验太精细太先进了，

生物克隆是热点问题 - SpeakingMax英语口语达人