crop up
出现
Crop pickers, violinists, construction workers, entrepreneurs, engineers, home health-care aides and physicists are among today’s birds of passage.
今天的候鸟式人群包括摘水果工人、小提琴手、建筑工人、企业家、工程师、家庭健康护理员和物理学家。
At the start of this century, about one-third of crop workers were over the age of 35.
本世纪初，大约三分之一的作物工人年龄超过35岁。
the high mobility of crop workers
农业工人的高流动性
Even if we converted all the suitable land to fields of fruit and veg — which would involve taking out all the nature reserves and removing thousands of people from their homes — we would achieve only a 30 per cent boost in crop production.
即使我们将所有适合的土地都改造成水果和蔬菜种植区——这将涉及清除所有自然保护区并迫使成千上万的人离开家园——我们也只能实现作物产量 30 的提升。
例句取自历年考研英语真题，翻译为机器生成，仅供学习参考。