Symptoms include irregular periods (earlier than the normal 28 days apart); periods that are heavier than usual; and periods that involve spotting rather than a regular flow.

现象有不规律的经期（比正常 的28 天周期要早），经期比平时的重，经期伴随着点块，而不是有规律的流体。

Short, steady practice is much better for learning than long periods on an irregular basis.

短时刻安稳的学习要比长时刻可是不规律的学习好得多。

Short, steady practice is much better for learning than long periods on an irregular basis.

短时间稳定的学习要比长时间但是不规律的学习好得多。

Irregular, painful periods and excessive or prolonged bleeding are symptoms that should be checked out by a doctor.

如果出现经期不正常、痛经、量过大、淋漓不尽等症状则要去看医生了。