shortage n
n短缺
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The effective period is double. So the shortage of N in the late stages of growing season has been compensated.
肥效期比普通碳铵延长一倍左右，有效地弥补了普通碳铵后期脱肥的不足。
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Beijing has about 100 cubic meters of water available per person, well below the U.N. standard of 1, 000 cubic meters per person, a threshold used to measure chronic water shortage.
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