only if

Political attacks work only if they find an echo with voters.

政治攻击只有在选民中引起共鸣才会有作用。

The after effect occurs only if the additive is present during irradiation.

在辐照过程中只有当添加剂存在时才出现后效应.

The placebo effect can be understood only if we acknowledge the unity of mind and body.

只有我们承认身心一体，安慰剂效果才能被理解。

Thick accumulations of peat can form only if the swamp basin slowly subsides.

只有当沼泽盆地慢慢下陷时,厚厚的泥炭堆积才能形成.

The meat market can continue only if it is radically overhauled to conform with strict European standards.

肉类市场只有经过彻底的大检查，严格遵守欧洲标准，才能继续营业。

The two sides will clash there only if Chelsea beat Sunderland in their quarter-final replay.

只有切尔西队在四分之一决赛的重赛中击败桑德兰队，双方才会交锋。

Syria will attend only if the negotiations deal with issues of substance.

只有在谈判涉及重大问题时叙利亚才会参加。

Only if we handle them with kid gloves.

只要我们小心行事就行了.

You can make progress only if you are modest.

惟虚心乃能进步.

Only if the red light comes on is there any danger to employees.

只要红灯一亮,就表示有危及职工的险情.

Positive semi - definite matrices are positive definite if and only if they are nonsingular.

正半定矩阵是正定的,当且仅当它们是非奇异矩阵.

Only if he turns over a new leaf.

除非他重新做人.

The remarkable part of Karatowski's theorem is the " only if " part.

库拉图夫斯基定理的卓越部分在于他的 “ 仅当 ” 部分.

I'll do that, but only if we set a few rules.

我可以干, 但我们得定几条规矩.

I told him I would work for him only if I could have a finger in the pie.

我告诉他我愿为他工作,只要让我参与此事.