在他七十八岁临终时，有一对双胞胎一直照顾着他。的翻译：When he was 78 years old dying, a pair of twins have been taking care of him. 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

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When he was 78 years old dying, a pair of twins have been taking care of him.

When his 78 years old just before the end, some pair of twin is looking after him continuously.

When he was 78 years old at death, there is a pair of twins has been caring for him.

When he was 78 years old dying, a pair of twins have been taking care of him.