发生于

These events occurred in 1909.

这些事件发生于1909。

Senile dementia is a series of chronic progressive mental deterioration occurring in or pre the geratic period.

老期痴呆是发生于老期和老前期的一组慢进行衰退疾病。

These tumors, to date, have occurred over a wide age range in postpubertal females, are characteristically unilateral, and confined to the ovary at presentation.

到目前为止，这些肿瘤发生于青春期后期女的一大段龄范围内，特征地出现于单侧，仅发生于卵巢。

Therefore, the albitization of plagioclase is shown in the early stage of diagenesis and albitization of potash feldspar appears only in the late stage of diagenesis.

因此，斜长石的钠长石于成岩早期，而钾长石的钠长石只发生于成岩晚期。

Results Murder cases of schizophrenics often took place to adolescent and postadolescent and lowincome crowd.Men did significant more than women did.Their degree of culture were low.

结果分裂症凶杀行为多发生于青壮及经济收入低的人群，男显著多于女，文程度偏低。