The third used the timing of light therapy as the control.
第三组以光疗法的时间作为对照。
The exact timing for first light is not known.
人们并不知道第一缕光线出现的时间。
Irrigation timing is important due to light rather shallow soils.
由于土壤轻松，土层又浅，及时灌溉是很重要的。
Irrigation timing is important due to light rather shallow soils.
由于土壤轻松，土层又浅，及时灌溉是很重要的。
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