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Why Does Ice Float on Water?
为什么冰能浮在水面上?
精读先不看文字,完整听一遍。
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Water is unusual because it expands when it freezes into ice.水很特别,结冰时反而会膨胀。
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Ice has more space between its molecules than liquid water.冰的分子间距比液态水更大。
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That makes ice less dense and lighter than cold water.因此冰的密度更小,比冷水更轻。
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So ice floats instead of sinking like most solids do.所以冰会漂浮,而不像大多数固体那样下沉。
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Floating ice keeps lakes and rivers from freezing solid in winter.漂浮的冰层使湖泊和河流在冬季不会完全封冻。
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This helps fish and plants survive under the surface.这有助于鱼类和植物在冰面下存活。
精读 · 大约 10 分钟
听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。
③ 学 · 重点表达
- This helps fish and plants survive under the surface. 这有助于鱼类和植物在冰面下存活。
- Ice has more space between its molecules than liquid water. 冰的分子间距比液态水更大。
- That makes ice less dense and lighter than cold water. 因此冰的密度更小,比冷水更轻。
④ 懂 · 选一选
⑤ 今天会说这一句
This helps fish and plants survive under the surface.
⑥ 跟读并录音
This helps fish and plants survive under the surface.
第一版:录下来、回听、再听标准音。系统打分以后再加。
⑦ 说 · 自己来一句
用今天的表达,自己说一句。
例子:This helps fish and plants survive under the surface.
已记下。连续天数以后会显示在课表里。
陈老师指导
课程开发中,敬请期待。成人和孩子都可以先自学听读、精读。
这边的讲解音轨还在做。想先跟着老师走完固定 30 课,可以去陈老师带读社(和自学通行不是同一份会员)。
课程开发中,敬请期待。