boiled egg

If one learns without thinking, one will be lost in his learning. That is, if one does not think about what one learns, he will not arrive at the truth of it.

a name of a hole of a wind instrument / five

dense

mutually, reciprocally

ordinal marker, often with prefix 第 (used like -st, -nd, -rd, -th in English).

to give something, to do something for someone

Japanese reading of the Chinese surname Wu. / the ancient State of Wu / (chiefly compounds) China, Chinese

China / to give something, to do something for someone

the Horse, the seventh of the twelve Earthly Branches