染色单体干扰（chromatid interference)——在细胞减数分裂过程中，两非姊妹染色单体间发生一个交换后影响相同两染色单体间发生第二次交换的现象。

English definition:

A situation in which the occurrence of a crossover between any two nonsister chromatids can be shown to affect the probability of those chromatids being involved in other crossovers in the same meiosis.

---http://www.biochem.northwestern.edu/holmgren/Glossary/Definitions/Def-C/chromatid_interference.html

My translation:

细胞在一次减数分裂中，两个非姐妹染色单体间发生的一次交换，影响了染色单体发生其他交换的现象。