查询词典 if and only if

Using the main result, we also obtain a simple criterion to check if a given C(superscript *)-algebra A is Abelian, that is, A is Abelian if and only for any two positive elements a, b∈A, there is a'∈A such that ab=ba'.

利用文中的主要结论，还得到了判断C-代数A是交换一个简单条件，即A是交换的当且仅当对A中的任何两个正元a，b存在a'∈A使得ab=ba'。

Using the main result, we also obtain a simple criterion to check if a given mathrm C^*-algebra A is Abelian, that is, A is Abelian if and only for any two positive elements a, bin A, there is a'in A such that ab=ba'.

利用文中的主要结论，还得到了判断 mathrm C^*-代数 A 是交换一个简单条件，即 A 是交换的当且仅当对 A 中的任何两个正元 a， b 存在 a'in A 使得 ab=ba'。

These macros are identical to DT_TRACE[0..3] except the additional f parameter allows you to pass a 32 bit flag field which will be and'd with the trace filter flag and only traced if at least 1 set bit matches.

3以外的额外f参数允许您通过一个32位标志字段，将与跟踪过滤旗号，只有在至少追溯到1套位匹配and'd。

Li set up, butcher, Roufan, veterinarians, milking, farm workers or animal husbandry is the high infection ethnic groups; Some patients regardless of it, so that their wounds, and only if the infection of cattle and sheep pox virus, may not have died of eating , Lactation or less.

李定达说，屠夫、肉贩、兽医、挤奶人、农场工人或畜牧业者是高感染族群；也有的病人不管它，让伤口自己好，牛羊只若感染副痘病毒，有可能不进食而死亡，或泌乳量减少。

Sunburst applies only as the spell is resolving and only if one or more colored mana was paid for its costs.

辉映只在该咒语结算的时候生效；并且必须是支付过一种或多种有色法术力时才会生效。

37B Sunburst applies only as the spell is resolving and only if one or more colored mana was paid for its costs.

502.37b 辉映只在该咒语结算的时候生效；并且必须是支付过一种或多种有色法术力时才会生效。

Frey and Messenger (1973) and Guy,Chou, Lin, and Christen- sen (1975) confirmed that a microwavepulse with a slow rise time is INeffective in producing an auditoryresponse; only if the rise time is SHORT, resulting in effect in asquare wave with respect to the leading edge of the envelope ofradiated radio-frequency energy, does the auditory responseoccur.

1973，1975年这些人FREY， AND MESSENGER，CHOU， LIN， CHRISTEN－SEN确认，缓慢增加的微波脉冲不会引起听觉反映，只有增强时间非常短暂，以至影响了辐射射频边缘，才会导致听觉反应。

Precautions: Ciprofloxacin should be used with caution in epileptics and patients with a history of CNS disorders and only if the benefits of treatment are considered to outweight the risk of possible CNS side-effects.

警告和注意事项：癫痫病人及有中枢神经系统病史的患者慎用环丙沙星，仅当认为疗效超过可能产生的中枢神经系统副作用的危险时才可使用。

1 Warnings and precautions: Ciprofloxacin should be used with caution in epileptics and patients with a history of CNS disorders and only if the benefits of treatment are considered to outweight the risk of possible CNS side-effects.

警告和注重事项：癫痫病人及有中枢神经系统病史的患者慎用环丙沙星，仅当认为疗效超过可能产生的中枢神经系统副作用的危险时才可使用。

1 Warnings andprecautions: Ciprofloxacin should be used with caution in epileptics and patients with a history of CNS disorders and only if the benefits of treatment are considered to outweight the risk of possible CNS side-effects.

警告和注意事项：癫痫病人及有中枢神经系统病史的患者慎用环丙沙星，仅当认为疗效超过可能产生的中枢神经系统副作用的危险时才可使用。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷