初等代数

elementary algebra

at first / (at the) beginning / first / junior / basic

elementary (i.e. easy)

class / rank / grade / equal to / same as / to wait for / to await / et cetera / and so on / et al. (and other authors) / after / as soon as / once

to substitute / to act on behalf of others / to replace / generation / dynasty / age / period / (historical) era / (geological) eon

algebra

to count / to count as / to regard as / to enumerate (sb's shortcomings)

number / figure / several / CL:個|个[ge4]

frequently / repeatedly