復(fù)雜修飾、倒裝
    解釋：與很多人的印象相反，lack從來就不能作形容詞，它只有動詞或名詞的詞性。其形容詞的形式是lacking，意思是缺乏的、不足的。
    本句的在however 之前和之后的兩個分句，是兩個倒裝結(jié)構(gòu)，前一個是小倒裝，正常語序是：to demonstrate refined structural differences among neuron types by other methods： however后面是個大倒裝，lacking之后的that引導(dǎo)的同位語人名是修飾主語proof的，但是因為它太長，所以為了避免頭重腳輕，被放到 lacking之后，正常的語序應(yīng)該是proof that the quality of ……was lacking
    意群訓(xùn)練：It was possible to demonstrate by other methods refined structural differences among neuron types; however， proof was lacking that the quality of the impulse or its condition was influenced by these differences， which seemed instead to influence the developmental patterning of the neural circuits.Although qualitative variance among nerve energies was never rigidly disproved，the doctrine was generally abandoned in favor of the opposing view，namely，that nerve impulses are essentially homogeneous in quality and are transmitted as "common currency" throughout the nervous system.
    盡管在神經(jīng)能量上存在著質(zhì)的不同，這一點從來都沒有在嚴格的意義上被反對過，但是以上教條通常被拋棄掉，而轉(zhuǎn)向相反的觀點，即：神經(jīng)沖動從根本上本質(zhì)相同，而且被當(dāng)作“一種普通流”在整個神經(jīng)系統(tǒng)中傳播。