Spending too much time indoors with all that artificial lighting can do that to you.
在室内呆太久，那些人工照明会对你造成如此后果。
Single-storey greenhouses have the benefit of natural overhead light: even so, many still need artificial lighting.
单层温室的好处是自然采光。即便如此，许多温室仍然需要人工照明。
But the greenhouses on the barge were only one storey high, so there was not much need for artificial lighting.
由于驳船上的温室只有一层楼高，因此不太需要人工光照。
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