And we obtain there are only four behaviours of the trajectories near the equator of the bounded cubic system if the homogeneous polynomials of degree 3 are relatively prime. In the third chapter,we study the existence and nonexistence of limit cycle for a class of bounded cubic systems.
第一章为引言；第二章，我们得到了齐三次项互素时三次Kolmogorov型系统有界的充分必要条件及其在赤道上孤立奇点附近轨线的分布情况有且仅有四种；第三章，我们研究了一类有界三次Kolmogorov型系统极限环的存在性与不存在性。
参考来源 - 一类三次Kolmogorov型系统的有界性及极限环·2,447,543篇论文数据，部分数据来源于NoteExpress
The official unemployment rate may be relatively low — but the percentage of prime-working-age Americans without jobs, which isn’t the same thing, is historically high.
官方公布的失业率可能相对较低——但是青壮年劳动力的失业率却达到了历史最高点，这是两个完全不同的概念。
The relatively larger GFP interferes with the function and mobility of actin, but actin molecules tagged with the smaller PRIME probes were able to move throughout the cell and even enter the nucleus.
相对较大的荧光蛋白探针会干扰肌动蛋白的功能和运动，但是通过小探针标记的肌动蛋白分子能够通过细胞甚至进入核心。
Google blends development with testing, having relatively few testers, and each product goes through successive channels before is ready for prime time.
Google把开发和测试紧密结合在一起，测试人员相对较少，每个产品在正式上线前都要经过好几个不同的版本。
应用推荐