An infallible remedy for toothache: wash the root if an aching tooth in vinegar, and let it dry half an hour in the sun.
对牙痛的一项万无一失的疗法是：把作痛的一根牙齿放进醋里洗净利, 然后置于阳光下半小时使之晒干。
His judgment in this matter was by no means infallible.
在这件事上他的判断决不是无可指摘的。
There are no infallible methods.
没有绝对可靠的方法。
