so far

used in negative statement to describe a situation that has existed up to this point or up to the present time

用在否定句中，用来描述到目前为止存在的情况

So far he hasn't called

到目前为止他还没有打电话

the sun isn't up yet

太阳还没升起

thus far

up to now

hitherto

heretofore

as yet

yet

til now

until now

used after a superlative

用在级之后

this is the best so far

这是目前为止要好的

the largest drug bust yet

迄今为止较大规模的交易

yet

to the degree or extent that

达到

insofar as it can be ascertained, the horse lung is comparable to that of man

在可以确定的范围内，马肺可与人肺相媲美

so far as it is reasonably practical he should practice restraint

只要合理可行，他就应该实行克制

insofar

in so far

to that extent

to that degree