21.   The researchers even gave vaginal birth the best opportunity to look good by analyzing separately if it made a difference how expert the doctor was at delivering breech babies.

22.   Vaginal births are less expensive and the patient spends less time in the hospital.

a. + birth >>共 241
premature 8.71%
low 8.45%
partial 7.51%
vaginal 2.95%
illegitimate 2.82%
home 2.68%
so-called 2.41%
first 2.28%
difficult 2.14%
new 1.88%
vaginal + n. >>共 79
dryness 10.32%
delivery 8.54%
birth 7.83%
wall 5.69%
infection 5.34%
discharge 4.63%
suppository 3.20%
yeast 2.49%
secretion 2.49%
canal 2.14%
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