비교문장의 병렬구조(parallelism in comparison)than 다음에 대명사, 전치사, 대동사 혹은 조동사를 필요로 할 경우가 있으니 주의해야 한다.
Higher concentrations were found in the substance W than in the substance T.
Sugar gave lower swelling temperature than did equal quantities of compound A.
The decrease in A was larger than that obtained for B.
The reactions of amine with macrolides proceed fivefold faster than do thoseof the peptide.
Blood flow to the thyroid gland is about one third of the renal blood flow. (X)Blood flow to the thyroid gland is about one third of that to the kidney. (0)