保育園: nursery school

生物兵器: a bioweapon, a biological weapon

でんでん太鼓: pellet drum

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.

to go; to come to one's place / to (a letter) be delivered / to depart / to rely (on a method) / (年が～) to age / (うまく～) to go well / イく: (slang) to have an orgasm, to come, to cum

sacrifice

silkworm

physical education / (by extension) physical exercise

education

National Aeronautics and Space Administration; NASA