Historically, lack of nitrogen, not lack of land or water, has been its biggest constraint.
从历史上看，缺氮，不缺土地或不缺水，一直是农业最大的制约因素。
Historically, the travel industry has been a transaction - or event-centered industry.
以往，旅游业是一个以交易为中心或以事件为中心的行业。
Historically, the travel industry has been a transaction - or event-centered industry.
以往，旅游业是一个以交易为中心或以事件为中心的行业。
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