1 marrow

2 pith

3 quintessence

4 essence

1 backbone

2 spine

3 Taiwan pr. [jǐ liang]

1 vertebra

2 backbone

1 bone marrow (medulla ossea)

1 roof ridge

1 lit. penetrate to the marrow (idiom); deeply affected

2 moved to the core

1 lit. to leap the house and cross the roofridge (idiom); dashing over rooftops (of robbers and pursuing knight-errant 俠客|侠客 in fiction)