half-shade angle 半遮角
angle of shade 保护角
minimum angle of shade 预期保护角
shade angle
阴角
以上为机器翻译结果，长、整句建议使用 人工翻译 。
If you keep your algae in ponds the rays do not always strike them at the best angle and the algae sometimes shade one another if they are growing densely.
ECONOMIST: Biofuels are back. This time they might even work
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