They would leave subtle clues in the isotopic composition of the limestone by shifting the ratios of light to heavy carbon and oxygen atoms in its calcium carbonate.
因为如果是那样的话，阳光将会被转换成大量的碳、氧原子保存到石灰岩中的碳酸钙里，而事实却是，岩层的同位素组成（Isotopic composition）中没有留下任何蛛丝马迹。
Traffic conditions refer primarily to the composition of the traffic stream, particularly the presence of trucks and other heavy vehicles.
交通条件主要指的交通流，特别是卡车和其他重型车辆的存在组成。
The fundamental method, program composition, actual application of the research of simulation on heavy haul trains and various specific simulation researches are described.
介绍了重载列车仿真研究的基本方法、程序组成、实际应用和各种具体的仿真研究。
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