算术
Her school report shows that she is weak at/in arithmetic and biology. 从她的学习成绩单可看出她算术和生物成绩差。
She grounded her pupils well in arithmetic. 她给自己的学生打下良好的算术基础。
The little boy was not good at arithmetic. 这个小男孩算术不太好。
He is clever at arithmetic. 他擅长算术。
