例句：
He described the difficulties of surviving for four months as a captive.
他描述了被俘4個月里掙扎求生的艱難歲月。
The election was held six months ahead of schedule.
選舉提前了6個月舉行。
The area has been the scene of fierce fighting for three months.
這一地區(qū)3個月以來不斷發(fā)生激戰(zhàn)。