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.
如果你把水藻种在池塘里，但是却不能以正确的角度用光线照射它们，那么如果水藻生长太过密集时，可能会相互遮挡。
youdao
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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