标题：China claims rocket first as it catches booster in floating sea netState media hails successful test in step towards reusable rocket technology for space flights知识点：up the stakes phraseto increase the level of risk, competition, or importance in a situation 加大赌注；提高竞争或风险等级• The rival company upped the stakes by launching a cheaper product. 竞争对手推出了一款更便宜的产品，加大了竞争筹码。• Both candidates upped the stakes in the final debate. 两位候选人在最后一场辩论中都提高了赌注。

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