Knowledge is often the blood brother of practice.

知識與實踐往往是不可分的.

This blood brother keeps asking me for money.

這位黑人兄弟老找我要錢.

Tuareg cavalryman seldom reveals his face, even to a blood brother.

圖阿雷格人,很少有人能看到他的臉, 甚至是親兄弟.

Bob's like a blood brother and would do anything for me.

鮑勃像親兄弟,愿意為我什么都做.