They tried several methods before they hit on this way of doing it.
我们试过好几种办法，最后才忽然想到要这么干。
I always have troubles in some stages of designing and having tried several methods feeding back rather bad result, my passion on the mission is fading.
习惯性并且阶段性的陷入思维上的僵局，自己有时候也不知道怎么解套，尤其是尝试了几种方法之后效果不佳，于是做下去的热情也开始消减。
Over time, I have tried and found several methods that are helpful to pull me out of a rut.
久而久之，我渐渐的尝试并发现了一些能使我摆脱困顿的方法。
Several surface modification methods and enzyme immobilization methods were designed and tried to search for the best surface modification method and the best enzyme immobilization method.
为寻找最佳的电极表面修饰方法及酶固定化方法，设计并实验了几种不同的电极表面修饰方法及酶固定化方法。
Several surface modification methods and enzyme immobilization methods were designed and tried to search for the best surface modification method and the best enzyme immobilization method.
为寻找最佳的电极表面修饰方法及酶固定化方法，设计并实验了几种不同的电极表面修饰方法及酶固定化方法。
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