However, chimpanzees are highly endangered species, but also a great size, easy breeding and rearing, the cost of expensive, difficult to study as an animal model of AIDS.
然而，黑猩猩是高度濒危物种，而且体型巨大，不易繁殖和养育，费用昂贵，难以作为艾滋病研究动物模型。
The HVEF treatment for silkworm eggs was obviously a simple and low-cost technique for silkworm rearing and silk yield.
该技术是一项简单易行、成本低廉的养蚕增丝新技术。
The HVEF treatment for silkworm eggs was obviously a simple and low-cost technique for silkworm rearing and silk yield.
该技术是一项简单易行、成本低廉的养蚕增丝新技术。
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