Gehrig, however, almost did not play. His mother had to have an operation.

然而，格里格差点没有打比赛。他的母亲不得不做手术。

Gehrig, however, almost did not play. His mother had to have an operation. He felt he should be with her.

但格里克几乎没上场，他的母亲要做一场手术，他觉得自己得陪着她。

Mother has got to have an operation.

母亲必须动手术。

If all else fails, you may be advised to have an operation.

【fail】要是其他手段都不见效的话，可能会建议你动手术。

He told her that he was writing instead of her mother who had not been well and was obliged to go into a nursing home to have an operation.

他告诉她，他正在代替她的母亲写作，她的母亲身体不太好，不得不去疗养院做手术。

The expression " to go under the knife" means to have an operation, to have a surgery, to be operated on, where the doctor actually has to take a knife and cut you open.

“去刀下”这个表达的意思是做手术，做手术，做手术，医生实际上必须拿刀把你切开。