Packer says introducing new genes raises the chances that an isolated group can resist novel diseases or genetic defects.
帕克说，引入新的基因，给孤立的种群一个新的机会，让它们可以抵御新的疾病或遗传缺陷。
The field applications in more than 300 wells showed that Y441 packer has good performance and can partially replace foreign products of same kind.
现场300多井次的应用表明，Y441封隔器性能优良，并部分地替代了国外进口的同类产品。
A packer assembly that can be removed from the wellbore only by drilling or milling.
仅能用钻或磨铣方法从井筒中去除的封隔装置。
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