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"The margin of error for the wedge is 1.5 centimeters. We have to measure precisely the influence of wind, current and buoyancy force," said Lin.

Dear Friends,

BEIJING, June 26 (Xinhua) -- Chinese President Xi Jinping on Monday called "one country, two systems" the best institutional arrangement for Hong Kong's prosperity and stability.

Since the establishment of diplomatic ties 53 years ago, Xi said, bilateral relations have weathered volatile changes on the international scene and have been increasingly strategic.

History is our best teacher. The glory of the ancient silk routes shows that geographical distance is not insurmountable. If we take the first courageous step towards each other, we can embark on a path leading to friendship, shared development, peace, harmony and a better future.