The theory research on the domestic circular economy of tourism proceeds rapidly, with the depth and the width reaching a certain level.

国内旅游循环经济的理论研究进展较为迅速，深度和广度都达到了一定的水平。

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In import side, with the appreciation of the real effective exchange of RMB, imports has occurred dramatic fluctuations after the appreciation magnitude reaching a certain level.

进口方面，随着人民币实际有效汇率的提高，进口在升值幅度达到一定程度之后出现了剧烈的波动。

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They are less successful motivators if they reward students for reaching a certain level of performance, such as achieving a passing score on a test, according to research by Roland Fryer.

FORBES: Motivation Matters: 40% Of High School Students Chronically Disengaged From School

Chase followed with a promotion on the British Airways card where cardholders could receive an extra 100, 000 miles by becoming a customer and reaching a certain spending level.

FORBES: Credit Card Issuers Dropping Some Fees