Use the box to perform form-level operations, such as selecting the form.
用这个框可以执行窗体级操作,如选择窗体。
2
They form an intermediate social level between the individual and larger "secondary" institutions based on impersonal relationships.
它们在个人和基于非个人关系的较大的“二级”机构之间形成了一个中间的社会层次。
3
From the Middle East the Chinese acquired a blue pigment—a purified form of cobalt oxide unobtainable at that time in China—that contained only a low level of manganese.