YOU SAID:

The heartbeat of the older brother is weak and abnormal.

INTO JAPANESE

兄の心拍は弱く、異常です。

BACK INTO ENGLISH

My brother's heartbeat is weak and abnormal.

INTO JAPANESE

弟の心拍は弱くて異常です。

BACK INTO ENGLISH

My brother's heart rate is weak and abnormal.

INTO JAPANESE

兄の心拍数は弱く、異常です。

BACK INTO ENGLISH

My brother's heart rate is weak and abnormal.