asmlinkage void _init start_kernel(void)函数前面的_init是什么意思,是关键字

英语翻译
It is important to realize that the linkage as shown in the figure is schematic.Itsdimensions are unknown at the outset and are to be found by this synthesis technique.Thus,for example,the length of the position vector Zi as shown is not indicative of the final length of that edge of link 3,nor are the lengths (W,Z,U,V) or angles of any of the links as shown predictive of the final result.

However,the molar ratio of each linkage was different between DIPsⅠandⅡ.怎么翻译?要专业点的.

英语翻译
Although genetic linkage and association mapping are based on the same underlying phenomenon — namely,
recombination — in practice these approaches have different characteristics for localizing trait loci,each with particular
advantages and disadvantages.
In linkage analysis,recombination events are directly observed (or inferred) in a family pedigree within a limited number
of generations,whereas in association analysis we make use of the consequences of non-recombination over many past
generations within a short interval surrounding a disease locus.Importantly,the difference between the two approaches
often leads to the identification of different classes of disease-related genetic variants.These differences could provide at
least a partial explanation for the often poor correspondence between the susceptibility loci identified in genetic linkage
and genome-wide association studies.
The table compares linkage analysis,represented here by an affected sibling pair (sib-pair) with one parent
heterozygous at a specific marker,and genetic association analysis,represented by a trio family with one affected
offspring and a heterozygous parent.In affected sib-pairs,what is estimated is the proportion of pairs sharing an allele
that is identical by descent; that is,as copies of one parental allele,where the identity of the shared allele is irrelevant.
The sharing proportion is a simple inverse function of the recombination fraction:high sharing proportion corresponds
to a small recombination fraction,which in turn points to genetic linkage.In trio families,the estimated quantity is the
proportion of affected offspring inheriting a specific marker allele:an excess of over 50% is indicative of association.