性交

Bainong 64',a resistant wheat variety to slow powdery mildew,'Jingshuang 16',a susceptible wheat variety to slow powdery mildew were crossed with each other and backcrossed with their F_1,and thus six generations including the parents were obtained.

慢白粉品种'百农64'与感病品种'京双16'杂交，F1自交并分别与两亲本回交，获得包括亲本在内的6个世代，分析了'百农64'慢白粉性的基因数目、遗传力和遗传模型。

In this study we mapped a grain length controlling gene named Lk-4 with SSR and CAPs markers by screening 800 recessive plants in a BC2F2 population derived from a cross of Shuhui527×Xiaoli and backcrossed with Xiaoli as the donor parent.

对F2和BC2F2 群体籽粒大小形状和千粒重的遗传分析表明，回交能将大部分对目的基因效应具有干扰修饰作用的微效基因多态性除去，从而有利于对目的基因型的准确鉴定；在F2和BC2F2群体中只发现两类籽粒长短表现型，即短粒和长粒，并且二者分离比例符合3：1的典型一对等位基因分离比例。

In different treatments there were significant differences in male sterility among INACs, of which I TA showed the highest rate of sterility and the best sterility stability under different conditions; meanwhile, altering nucleo cytoplasmic relationship by substitutional backcrosses could modify and improve male sterility of CMS lines.

结果表明，同核异质不育系不育度在年份间、播期间、实生稻与再生稻间差异极显著，不同细胞质不育系间差异显著，其中I特A在各种处理条件下均表现出最高的不育度和最好的不育稳定性。通过回交核置换技术培育新核质关系的同核异质不育系，可达到修饰改良育性的目的。

With the increasing of directional backcrossing generationstransferred, variation coefficient and uniformity degree of different hybrid groupsdecreasing.

结果表明，随着定向回交世代的增多，杂交种群体内的变异幅度减小，群体整齐性逐渐提高。

The results in this study suggested it was practical to improve rice DT and identify favorable DT genes/QTLs by backcrossing and imposing critical selection on the target trait.

本研究结果说明，回交导入结合目标性状极端选择的策略改良水稻抗旱性并发掘和定位有利抗旱基因／QTL是可行的。

NOD/SCID (non-obese diabetic/severe combined immunodeficient) mice are immunodeficient mice which are generated by backcrossing severe combined immunodeficient mice with non-obese diabetic mice strains.

NOD/SCID（非肥胖糖尿病／重症联合免疫缺陷）小鼠是在SCID小鼠的基础上与非肥胖性糖尿病小鼠品系回交的免疫缺陷鼠。

The Builder shall furnish a guidance booklet at delivery for recommendable distribution of cargo etc. at loaded and ballasted conditions to ensure proper trim, stability and strength data during the service.

建造方交船时应提供一份指导手册用于建议在载货和压载条件下货物等的分布，以使该船在航行状态下具有正确的平衡，稳性和强度。

Simulation results show that this supplementary controller efficiently damps the power oscillation among areas,improves system stability,and has better robustness in various operation modes than the conventional supple-mentary damping controller.

仿真结果表明，与传统的阻尼控制器相比，基于强化学习算法的直流附加阻尼控制器能够有效地抑制区域间的功率振荡，提高交直流系统的动态稳定性，并且对多种运行方式具有一定的鲁棒性。

Desulfurize cell deoxidizes the sulfuric acid to its deoxidization form ,then fixs it on the protein for degradation SO2 of flue gas. And the activating energy of immobilized cell to degrade SO2 is 39.5 kJ/ mol.

用活性碳吸附海藻酸钠包埋已二胺交联制备固定化微生物不仅能保持微生物较高的活性，而且还具有高的机械强度、好的传质性和强的耐酸性。

LESS RISKY ━ Oral sex unprotected, without your partner ejaculating in your mouth HIV virus is also found in pre-cum

危险性较小情形-无保护口交行为，性伴侣未在口中射精（HIV病毒亦见于患者的精前液

I think he's learned how to approach hitters....

Johhny Damon说，『他已是最好的了，再没有人能够比他做的更好，我想他的球技已经完全成熟了，而且他也已经学会了如何去对付和压迫各种打击者。。。。。。

In effect, an 18 foot King Cobra could actually look down onto the average human being.

际上，一个18尺眼镜蛇王其实可以俯视到的平均人。