1. They are dangerous only if programmers are careless. 只有当程序员粗心大意时，它们才是危险的。
2. But only if they operate at near capacity, otherwise, their overall efficiency is poor. 但只能是在它们接近满负荷运转的情况下，否则整体效率就会很低。
3. Eye of newt goes into the little black bag, if and only if there is reproducible scientific evidence that it works. 当且仅当有可重复的科学证据证明蝾螈之眼有效时，蝾螈之眼才会进入小黑袋中。
4. The first draft will appear on the page only if you stop avoiding the inevitable and sit, stand up, or lie down to write. 只有当你不再回避不可避免的事情，而是坐着、站着或躺着写作时，初稿才能跃然纸上。
5. That would be true only if you believed that patients should have an unrestrained right to treatments proven to be inferior. 只有当你认为患者有权不受限制地享有已证劣等治疗时，这才是正确的。
