片语
volcanoes active per year活跃??火山每年
per annum每年
inches penetration per year每年腐蚀英寸数
fault time per year年故障次数
the yield per unit year单产
per annual每年
multimillion pound per year每年数百万英磅的
total rainfall per year年总降雨量
up 42 per cent year-on-year年同比上升了
sow productivity per year母猪年生产力
lifting competence per year年提升能力