安徽合肥"享受运动 健康生活"开放日活动现场。 施 觉摄（影像中国） 北京市民在全民健身活动中学习网球。 王子诚摄（影像中国） 动作演示：湖北省网球学校教练吴杰隆 （罗敏彰摄） 随着中国网球运动员在赛场上连连取得突破，看网球比赛、打网球成为健身新时尚，但不少初学者常常 感到"上手难、进步慢"。网球怎么练？本报记者邀请专家带您探探门道。 如何入门？ 作为从教23年的网球教练，北京市朝阳区明诚外国语学校体育教师金路认为，练好基本功、科学训练、 循序渐进，是初学者入门的关键。在初学阶段，球感是门槛，技术动作是地基，身体移动是关键。 一、球感靠"多玩" 类似杂耍的抛接球、颠球、拍球等练习都是很好的球感训练。在进行颠球练习时，新手握拍方式可以采 用"大陆式"——想象手里握着一把菜刀切菜，或握着一把锤子。这种握法通用于发球、双手反拍击球、 切削球、截击等多项技术动作。 二、动作要规范 初学者可以先学正手与反手基本击球，动作可分解为三步——侧身引拍、击球、随挥。 正手侧身引拍：以右手持拍为例，采用东方式握拍，若来球飞向自己的身体右侧，立即向右侧身，同时 根据来球的深浅，上左脚或撤右脚，同步将球拍拉开，拍柄底盖指向来球，拍头 ...

Core Viewpoint - The impact of high tariffs imposed by the U.S. government is leading to a significant decline in container traffic at the Port of Los Angeles and the Port of Long Beach, which together account for 40% of the nation's total container volume [1][4]. Group 1: Container Traffic Decline - The Port of Los Angeles has seen about 20% of ships scheduled to arrive in May canceled, with cargo volumes down approximately 35% compared to the same period last year [2]. - The Port of Long Beach, which was the largest container port in the U.S. in Q1 2025, anticipates a decline in throughput by 35% to 40%, with only 3 ships arriving this week instead of the usual 17, representing a reduction of over 50% [3]. Group 2: Impact on Importers - U.S. importers are struggling to place orders for consumer goods such as furniture, toys, and clothing due to high tariffs and unpredictable tariff policies, leading to a significant drop in demand [4]. - Approximately 125,000 importers operate around the Port of Los Angeles, none holding more than 5% market share, and many are unable to afford the increased costs of imports, which have risen by 2.5 times [5]. Group 3: Consumer Effects - Many imported goods are currently stuck in China, and consumers are facing price increases; for example, a pair of tennis shoes priced at $175 could rise to about $350 due to tariff changes [6]. - American consumers are likely to experience shortages and high prices for essential goods, as many retailers have only one to two months' worth of inventory left [8]. Group 4: Broader Economic Impact - The reduction in container volumes will lead to decreased logistics and retail activity, potentially resulting in job losses and lower incomes across the supply chain [10]. - The high tariffs are causing a ripple effect throughout the U.S. economy, impacting not just ports but also the broader industrial landscape, as companies reliant on imported materials face production challenges [10].

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