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Least effective were chlortetracycline, oxytetracycline, and tetracycline.是什么意思？

Least effective were chlortetracycline, oxytetracycline, and tetracycline.

效力最差的是金霉素 、 土霉素和四环素.

相关词汇
least effective were chlortetracycline and

least

pron. 最小的，最少的，程度最轻的；adv. 最少，最小；

effective

adj. 有效的，起作用的，实际的，实在的，给人深刻印象；n. [军]现役兵额，有生力量，精兵；

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

chlortetracycline

n. 氯四环素；

and

conj. 和，与，而且，于是，然后，因此；
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