Choose the correct alternative for the translation of the un...

Choose the correct alternative for the translation of the underlined words, according to the text.

China and the United States are maintaining close communication on bringing about exchanges between their presidents and at other levels, Foreign Ministry spokeswoman Hua Chunying said on Tuesday. Media reports on Monday said the two presidents would hold their first summit next month. "Both sides highly value enhancing high-level and other levels of exchanges between the two countries," she said at a daily news conference in Beijing. "We will re lease further information in a timely manner," Hua said.

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