发生于

These events occurred in 1909.

事件发生1909。

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

老期痴呆是发生老期和老前期的一组慢性进行性精神衰退性疾病。

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，肿瘤发生青春期后期女性的一大段龄范围内，特征性地出现单侧，仅发生。

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，斜长石的钠长石化可见成岩早期，而钾长石的钠长石化只发生成岩晚期。

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.

结果精神分裂症凶杀行为多发生青壮及经济收入低的人群，男性显著多女性，文化程度偏低。