鼻の上でボールのバランスを保つのは難しい。

nose

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

above; up; over; elder (e.g. daughter); top; summit; surface; on; before; previous; superiority; one's superior (i.e. one's elder); on top of that; besides; what's more; upon (further inspection, etc.); based on (and occurring after); matters concerning...; as concerns ...; since (i.e. "for that reason"); suffix indicating higher social standing; place of one's superior (i.e. the throne); emperor; sovereign; shogun; daimyo; noblewoman (esp. the wife of a nobleman)

indicates location of action; at; in; indicates time of action; indicates means of action; cause of effect; by; and then; so; indicates continuing action; indicates certainty, emphasis, etc.

hall (dance, concert, etc.); hole; whole; dining area of a restaurant

balance

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to keep; to preserve; to hold; to retain; to maintain; to support; to sustain; to last; to endure; to keep well (food); to wear well; to be durable

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

difficult; hard; troublesome; complicated; serious (disease, problem, etc.); fussy; particular; fastidious; hard to please; displeased; gloomy; glum; sullen; serious (look); dirty; unclean; filthy; detestable; unpleasant; uncomfortable; creepy; spooky