on; on top; upon; first (of two parts); previous or last (week etc); upper; higher; above; previous; to climb; to go into; above; to go up; to attend (class or university); third tone of putonghua[cedict]
很多
hěn duōㄏㄣˇ ㄉㄨㄛ
very many; very much; great (quantity)[cedict]
事情
shì qíngㄕˋ ㄑㄧㄥˊ
affair; matter; thing; business[cedict]
他
tāㄊㄚ
he; him[cedict]
都
dōuㄉㄡ
dūㄉㄨ
all; both (if two things are involved); entirely (due to) each; even; already[cedict]
capital city; metropolis; surname Du[cedict]
知道
zhī daoㄓ ㄉㄠ˙
know; be aware of[cedict]
发明
fā míngㄈㄚ ㄇㄧㄥˊ
to invent; invention[cedict]
难
nánㄋㄢˊ
nànㄋㄢˋ
difficult (to...); problem; difficulty; difficult; not good[cedict]
disaster; distress; to scold[cedict]
的
deㄉㄜ˙
díㄉㄧˊ
dìㄉㄧˋ
of; structural particle: used before a noun, linking it to preceding possessive or descriptive attributive[cedict]