the second rank derivative is the knaggy property reflection of curve, at certain range, if the sign of the second rank derivative has changed, the correspondence depth point represent the inflexion of geophysical logging curve, it＇s also a turning point of the reflection of knaggy change property of the curve, it is the interface of stratum.
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As it happens, a wide range of scientific studies support the idea that sleep is necessary for helping to "consolidate" memory, or at least certain types of memory.
如果是这样的话，大量的科学研究(结果)支持“睡眠有助于‘巩固’记忆”这个观点，至少是某种特定的记忆。
You can do so by building towers, which will fire at the monsters within certain range.
你可以这样做，由建设水塔，将炮弹内的怪物在一定范围内。
Experimental and analytical results show that the system can be used to study the friction drag of the vehicle models at certain speed range, which full-fills the design demand.
试验和分析结果表明，该系统在一定的速度范围内可以有效地测试航行器模型所受摩擦阻力，满足了设计要求。
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