* But that he conditioned the electrode, frequent calibrations would have been required.

如果不是他在使用前调节了电极，则需要经常加以校定。

4. but for后接名词或代词，常用于虚构的条件句，可译为“如果没有”、“若非”等。 如：

* The computation would not have been carried out but for a high speed electronic computer.

要是没有高速电子计算机，这项计算工作是完成不了的。

* But for the ozone layer, more people would get sunburns, skin cancer and cataracts.

如果没有臭氧层，许多人就会患上晒斑、皮肤癌、白内障等疾病。

* Ordinary movements would be impossible but for friction.

如果没有摩擦力，常见的活动就不可能进行。

责任编辑：admin