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1) 经常性或习惯性的动作，常与表示频度的时间状语连用。
时间状语： every…, sometimes, at…, on Sunday
I leave home for school at 7 every morning.
He cycles to work every day.
2) 客观真理，客观存在，科学事实。
The earth moves around the sun.
Shanghai lies in the east of China.
Water boils at 100 centigrade degrees.
时间状语： every…, sometimes, at…, on Sunday
I leave home for school at 7 every morning.
He cycles to work every day.
2) 客观真理，客观存在，科学事实。
The earth moves around the sun.
Shanghai lies in the east of China.
Water boils at 100 centigrade degrees.
