show的过去式和过去分式
例句：
Ultrasound showed she was expecting twins.
超声波扫描显示她怀了双胞胎。
He showed great courage and determination.
他表现得十分勇敢和果断。
She showed impatience to continue the climb.
她表现出要继续往上爬的急切。
He has shown himself to be ready to make compromises.
他表现出自己愿意妥协。
Tests have shown high levels of pollutants in the water.
Midfielder Elliott has shown disappointing form recently.
中场队员埃利奥特近来表现令人失望。
