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F= Xi Ye+ XeYi F=XeYi-Xi Ye F= XiYi +XeYe F= Ye- Y i
makes its breath takes its breath holds its breath lets its breath
put on … where put away … in the place put on … there put away … where
will rain: had is raining; have had rains; had is going to rain; have had
rain, report last, reported stop, reported lasted, report
斜线终点坐标（Xe，Ye），当︱Ye︱>︱Xe︱时，计数方向取GY 斜线终点坐标（Xe，Ye），当︱Xe︱>︱Ye︱时，计数方向取GY 圆弧终点坐标（Xe，Ye），当︱Xe︱>︱Ye︱时，计数方向取GY 圆弧终点坐标（Xe，Ye），当︱Xe︱<︱Ye︱时，计数方向取GY
it had stopped；before it had stopped；then had it stopped；than had it stopped；when
rain, report last, reported stop, reported lasted, reported
It’s raining cats and dogs Too many cooks spoil the broth Every dog has its day When the cat’s away, the mice will play
it had stopped; before it had stopped; then had it stopped; than had it stopped; when
was raining is raining raining has been raining
is snowing; have had is raining; will have snow; have will snow; had
it had stoppeD.before it had stoppeD.then had it stoppe than D. had it stoppeD.when
rain, report last, reported stop, reported lasted, reported
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