That matters because theory suggests that the maximum sustainable yield that can be cropped from a fishery comes when the biomass of a target species is about 50% of its original levels.

这确有其事，因为理论告诉我们如果一个渔场的总储量如果连起初的最大可承受的捕鱼量的50％都不到，就应该降低捕鱼数量。

" It keeps cropping up, doesn't it? " she said.

“它一直出现，不是吗？”她说。

With genetic modification becoming commonplace, modified crops will be grown indoors.

随着基因改造的推行，转基因作物将室内种植。

Instagram is a wash with animal photos and pet accounts, but it's Karl's kitty who is really the cream of the crop.

Ins上到处都是宠物博主和动物照片，但卡尔的猫确实其中最棒的。

“My granddaughter is afflicted by a crop of warts, sir, ” she told him.

“我孙女身上长很多疣，先生，”老农妇对他说。

It's now more of a crop top, risen up a little.I grew out of it.

现脐上衣 我现穿不下。

Disputes crop up over trivial things, like responsibility for the cost of a patient's bath.

小事上经常出现纠纷，比如病患洗澡的费用该由谁承担。

Rain or shine, there's always a bumper crop of stories.

无论下雨或天晴 精彩故事永不停。

Grain acreage will be kept stable, per unit crop yield will be increased, and the quality of grains will be raised.

稳定粮食播种面积，提高单产和品质。

During the 1840s, blight raced through Ireland's potato crop, lleading to a famine that killed at least 1 million people.

19世纪40年代时，枯萎病迅速蔓延爱尔兰的马铃薯作物，因而引发一场粮荒，至少有一百万饿死。

Crop pickers, violinists, construction workers, entrepreneurs, engineers, home healthcare aides, and physicists are among today's birds of passage.

收庄稼、小提琴手、建筑工、企业家、工程师、家庭护理助手和医生等构今天的移民。

Poor crops so diminished the food supply that people were starving.

由于收不佳，食物供应减少，以致于们都挨饿。

It's called, Out From Under extreme crop tank top shrug.

它叫做，超清凉极短无袖上衣。

Together, these conditions would hinder crop and agriculture production, eventually leading to food shortages.

这些条件加一起将阻碍作物和农业生产，最终导致粮食短缺。

They serve as a natural fertilizer and help support the roots of future crops. They take in rain and allow it to flow into the soil instead of running off.

这个小口子发挥着天然肥料的作用，而且能够帮助支撑之后种下的庄稼的根茎。它们盛纳雨水并将其导入泥土中，而不是任其白白流走。

Hey the Yellow River flooded again and destroyed all your crops.

嘿，黄河又发大水，摧毁你所有的庄稼。

Much of Chiang Mai's current pollution is a result of farmers burning crops.

清迈当前空气污染的主要根源是农民燃烧秸秆。

The dreaded word ''indecent'' began to crop up whenever his name was mentioned.

当他的名字被提起时，诸如“太不象样”这样刺耳的话开始出现。

She said the goal is more than just creating a new crop of workers.

她说，其目标不仅仅是创造一批新工。

C) They cannot boost crop yields without causing greenhouse gas emissions.

C）它们无法不造温室气体排放的情况下提高作物产量。