以512矿床为例，研究了砂岩铀矿体铀、钍含量及其放射性同位素分布规律，由此讨论铀矿体的定位条件。
Exemplified by No. 512 uranium deposit, this paper discusses the delineation of ore bodies in sandstone type uranium deposits by uranium and thorium concentrations and their radioisotopes.
也就是说，进入第二个表引用和第三个表引用的探测只将有效地定位匹配联接条件的记录。
That is, each probe into the second table reference and the third table reference would efficiently locate the only record that matches the join condition.
所有这些条件都促使许多从定位服务启动的网站的产生。
All this has helped give birth to a number of location-based start-ups.
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