They thoughtlessly planned a picnic without him.
他们考虑不周，安排了一次野餐却没带上他。
It is also a very serious matter when someone-deliberately or thoughtlessly-pollutes our water supplies.
人污染水源，是蓄意也好，无心也罢，后果都会非常严重。
It is also a very serious matter when someone-deliberately or thoughtlessly-pollutes our water supplies.
人污染水源，是蓄意也好，无心也罢，后果都会非常严重。
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