only adj. 1.唯一的。 2.无比的,独一无二的;最适当的。 an only child 独生子。 This is the onlyexample [These are the only examples] I know. 我知道的例子只有这一个[这些]。 one's only hope 某人的唯一希望。 the only man present 唯一的出席者[在场的人]。 He's the only man for the position. 他是最适宜那个职位的人。 adv. 1.仅仅;只,单,才;不过。 2.结果却;不料。 I can only guess [guess only]. 我只能推测罢了。 O- I [I only] can guess. 只有我能够猜得出。 O- fancy! 想想看罢!He came only yesterday. 他是昨天才来的。 He went to the seaside only to be drowned. 他去海边游泳结果却淹死了。 if only 只要…,只要…就好了 (If only he would stop talking! 只要他不讲话就好了)。 not only ... but (also) 不但…而且…。 only by ... can ... 只有…才能…。 only just 好容易;刚刚才;恰好 (I have only just received it. 我才收到。I was only just in time.我刚好赶上)。 only not 简直是;跟…差不多。 only too 极,太,非常;实在;可惜(only too glad 极乐意 (to do)。 only too true 千真万确)。 1.但是,可是。 2.〔与 that 同用〕除了…;要不是…。 He makes good resolutions, only he never keeps them. 他决心虽好,但不能持久。 I should like to go, only that I am ill. 我倒很想去,可是我有病。 only for 要是没有 (O- for my tea, I should have had the headache. 要是不喝茶,我又会犯头痛病了)。
A rational decision maker takes an action if and only if the marginal benefit of the action exceeds the marginal cost 只有当这个行动带来边际利润超出它的边际成本时,一个理性的决策制定者才可以实施这个行动。
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Theorem 4 space x is a cosmic space if and only if x is a - compact space with a - weakly hereditarily closure - preserving pair - networks , x 。具有。遗传闭包保持双网络当且仅当或者每x ‘ ,是cosmic空间且除可数个a外, x 。
Theorem 1 ( bounded sum test ) a series of nonnegative terms converges if and only if it ' s partial sums are bounded above 定理2 (比较审敛法)设和都是正项级数,且。若级数收敛,则级数收敛;反之,若级数发散,则级数发散。
There ' s another logic operation called exclusive or , in which the compound sentence is false , not true , if and only if all the components are true 还有另外一种逻辑操作叫做异或:当且仅当所有的成员为真时,结果才为假。 ”
Theorem 1 . 2 . 5 a semiring s is a normal a - idempotent semiring , if and only if s is a strong right normal idempotent semiring of left zero idempotent semirings 5半环s是正规a -幂等半环,当且仅当s是左零幂等半环的强右正规幂等半环。定理1
For system iii , it is structurally stable if and only iff ; for system iv , it is structurally stable if and only if p1 , p2 , p3 0 系统3为结构稳定的充要条件是e 0系统4为结构稳定的充要条件是月人, gxo ?系统5为结构稳定的充要条件是片xo
To summarize , the impersonation scope of a context established within a database can be extended to other scopes if and only if the following is true 概括而言,当且仅当满足下列条件时,可以将数据库内建立的上下文的模拟作用域扩展到其他范围:
Theorem 2 . 2 . 4 a semiring s is an additive normal c - idempotent semiring , if and only if s is a pseudo - strong right normal idempotent semiring of left zero semirings 4s是加法正规c一幂等半环,当且仅当s是左零半环的伪强右正规幂等半环定理2