原子核质量和大小的不同引起同位素移动。
Changes of nuclear mass and nuclear size cause isotope shifts.
用同位素d_2o和KCL作示踪物，在间断灌水的条件下，追踪了D_2O和阴、阳离子在土柱中移动的动态。
Under the conditions of uninterrupted irrigation D_2O and KCL as the tracers traced the kinesis of D_2O, positive and negative ions in the edaphic column.
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