Friendship in its usual sense is not tested by the strain of daily, year-long cohabitation.
通常意义上，友谊不会受到日复一日、年复一年的同居生活的压力考验。
2
While cohabitation has been on the rise, the overall share of young adults either married or living with an unmarried partner has substantially fallen since 1990.
尽管同居现象一直呈上升趋势，但自1990年以来，已婚或与未婚伴侣同居的年轻人的比例总体大幅下降。
3
The decline in marriage has been offset by a rise in cohabitation.