您要查找的是不是：
- true back mutation 真正回复突变
- It is positive reaction when the number of back mutation of strain is twice more than that of spontaneous back mutation. 菌株回复突变数与自发回复突变数相比超过两倍以上,为阳性反应
- That must have been true back in the Pliocene, more than two million years ago, when meat was added to the menu of our plant-chomping forebears. 菜单上多了肉，对于我们那些生存于200万年前上新世、咀嚼著植物的祖先来说，也一样有风险。
- Results of Ames test showed that number of colony with back mutation(revertants)in varied strains of Salmonella typhimurium at different doses did not exceed the double of the number of those with spontaneous mutation. Ames实验显示各菌株的各剂量组的回变菌落数均未超过自发回变菌落数的 2倍。
- reversible mutation(back mutation) 回复突变
- Rose bushes shoot again after being cut back. 玫瑰丛修剪後还能再长出新枝。
- Her dream to enter the famous university came true. 她要进入名牌大学学习的梦想实现了。
- The novel originally came from a true love affair. 这本小说原先是从一个真实的爱情故事发展而来的。
- I believe that he will show his true colors someday. 我相信他总有一天会现出原形的。
- True visionaries are often misunderstood by their own generation. 真正有远见卓识的人往往招致同时代人的误解。
- He trudge three hour in the snow to get back home. 他在雪中跋涉三个钟点才回到家。
- The crowd fell back to let the players through. 人群后退让运动员们通过。
- Do exercise every day and you'll be back in condition. 每天锻炼锻炼，你很快会恢复健康的。
- She gave the true account of what had happened. 她如实地讲述了发生的事情。
- The ship beat back against a monsoon. 船逆着季风艰难地行驶。
- His wish to be an actor has come true. 他想当演员的愿望实现了。
- True friendship is worth more than money. 真正的友谊比金钱更有价值。
- I flap the flies away but soon they fly back. 我把苍蝇赶走，但一会儿又飞回来了。
- I never lend books; you never get them back. 我的书决不外借，因为总是有去无回。
- She leaned her head back and whispered the news. 她向后仰着头，小声说出了这个消息。
