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需要：require, need, it is necessary for..to..,demand
不变：fixed, constant, stable, unchanged (unchanging)
担心：worry about, be concerned about, care about
导致，引起：cause, result in, lead to, bring about, contribute to
限制：limit, restrict, confine, put a limit on
正在做，努力：work on
延期相关：more time, extra time, extension, later deadline; put off, postpone, put back to, delay, (until)
因素：cause, factor, reason
合适：fit, suit, be suitable/fit/right
解决：solve/resolve, address, deal with, work out, tackle
解释：tell, explain, spell out, say how | 
