人口密度的上升，结合其他如气候变冷变旱的因素，使采猎为生的纳图夫人(Natufian—约公元前1万年的史前人)短缺橡果、羚羊和野草种。
Rising human population density, combined perhaps with a cooling, drying climate, left the Natufian hunter-gatherers of the region short of acorns, gazelles and wild grass seeds.
针对化为规范型约非线性系统，讨论了对其实施变结构控制问题。
Then based on the normal form systems, variable structure control and some related problems were discussed.
菠萝果皮中原花青素含量是果肉的5倍，总酚含量高约50%，叶绿素主要存在于果皮中，这些物质是引起带皮榨汁法比去皮榨汁法产品褐变严重的主要原因。
Proanthocyanidin content in pineapple peel was about 5 times to fruit pulp, and the total phenol content was approximately 50% higher, chlorophyll mainly exists in peels.
他们的确知道骨质疏松症是导致较多的死亡的原因，但是，患骨质疏松症的老年人身高变矮约6厘米。
We do know that osteoporosis is linked to more deaths. However, osteoporosis brings with it a height loss of about 6cm.
水泡会有痒感，并在出现约三天后会变干、结痂。患者通常约于二至四星期内痊愈。
The vesicles are itchy , they dry up and form a scab in about three days . the patient usually recovers in about 2 to 4 weeks.
与野生型相比，突变体除了整个植株变脆、纤维素含量降低约10%外，表型与野生型相似。
This mutant displays normal phenotype similar to its wild type plants except for the fragility of all plant body, with 10% decrease in the cellulose content.
平扫低密度区及空洞增强后无强化，其余实变区域强化明显，强化前后CT差值平均约44HU。
After contrast-enhanced scans, hypodense areas and cavities seen on precontrast CT images had no enhancement but remainder consolidation areas had significant enhancement with 44 HU value.
凯威尔和施密特说，这一转变可能发生在约7百万年前，但至今尚未找到有关的化石。
There are no fossils from the time of this transition, which likely occurred about seven million years ago, Kivell and Schmitt said.
凯威尔和施密特说，这一转变可能发生在约7百万年前，但至今尚未找到有关的化石。
There are no fossils from the time of this transition, which likely occurred about seven million years ago, Kivell and Schmitt said.
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