它们大部分是无害的。
其中大部分是无害的。
因为每个个体他的整个染色体携带无数的SNPs，其中大部分无害，所以鉴别出真正与特定疾病有关的变异显得尤为困难。
Because each individual carries countless SNPs throughout his or her genome, most of which are harmless, it is difficult to identify the mutations that are truly related to a particular disease.
猪鼻蛇，有时也被称作膨身蛇，是自然界丑角中的一员。 有人认为它是剧毒蛇，其实，它恰恰是无害的，其大部分时间用于捕捉蟾蜍。
The hognose snake，sometimes called the puff adder，is one of nature's clowns．Some people think that he is deadly poisonous．Actually，he's just a harmless fellow who spends most of his time huntingtoads．
幸运地是，这些微生物大部分都是无害的。
然而大部分都是无害的，并且在生完孩子之后就会消失。
However, most of them are harmless and will often go away after you give birth.
美国电力系统具备25亿瓦的泵送水电容量，但大部分优而廉的水库已被占用，而创建新水库并非对环境无害。
The U.S. electric system has 2.5 gigawatts of pumped hydro storage capacity, but most of the good, cheap sites are already occupied, and creating new reservoirs is not environmentally benign.
庆幸的是，这些绝大部分突变是无害的，并不对我们的健康或外观造成明显的影响。
Fortunately, most of these are harmless and have no apparent effect on our health or appearance.
大部分的胎记不是血管瘤就是色素痣。通常无害，有许多在孩童时期会自动褪去，褪不掉的有时可用雷射手术或磨蚀来除去。
Most birthmarks are either hemangiomas or moles. They are usually harmless and many fade in childhood; those that do not can sometimes be removed by laser surgery or abrasion.
虽然大部分的这些主张似乎小学或无害，所有的争议性。
Though most of these propositions may seem elementary or harmless, all are controversial.
虽然大部分的这些主张似乎小学或无害，所有的争议性。
Though most of these propositions may seem elementary or harmless, all are controversial.
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