The occurrence of any one thing can not be separated from its background.

发生任何一件事都离不开它的背景。

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There was also not significant difference to the occurrence of aphis between advanced one week for irrigation to pushing one week for irrigation based on the middle irrigation quota in budding stage.

常规灌溉量条件下花蕾期提前一周灌水和推后一周灌水对棉蚜发生的影响不大。

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As recently as 10 years ago, having one's picture taken was not an everyday occurrence.

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That this is not a daily occurrence in capitals like Tokyo is due to one thing: mass rail transport.

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