原材料引用(Materials)
The researchers say any kind of CPR improved chances of the patients' survival.
But they said those people treated with only chest pressessuffered less brain damage.
信息与事实(fact)
冬练三九早起晨读19
冬练三九早起晨读19
感受与评价(camment)
【tr】先发t，再发r
舌身保持发/r/的姿势，舌尖贴在齿龈后部，堵住气流，气流冲出。在发出短促的t后，立即发r音。发音时，声带不振动。发【tr】这个音时口型应保持圆唇
【dr】舌身采取发d的姿势，舌尖向上贴住上齿龈后部，形成阻碍。舌头放开,让气流从舌尖和齿龈间冲出，冲破阻碍发出短促的d后立即发r。双唇稍稍突出，略成圆形。dr是浊辅音,不送气，声带振动。注意这个音包含有卷舌音的音素，舌头要上卷
清辅音和浊辅音的区别是声带的震动与否，又学到一个。
练习小时数(hours)
90分钟
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