“thereof”一般来讲，是对前面出现的“……of……”这个结构的缩写，而且省略的是“of”后面的内容

1例句

中国外汇市场准则适用于经我国监管部门批准所从事的外汇交易业务，包括银行间外汇市场业务、结售汇业务、外币买卖业务的经营机构及其内部从业人员。

Chinese foreign exchange market guidelines are applicable to foreign exchange trading business conducted upon approval by our country’s supervision departments, including institutions operating inter-bank FX market business, FX settlement and sale business, FX sale and purchase and foreign currency trading and internal practitioners thereof.

2例句

Each Class B Common Share is convertible into one (1) Class A Common Share at any time by the holder thereof. The right to convert shall be exercisable by the holder of the Class B Common Share delivering a written notice to the Company that such holder elects to convert a specified number of Class B Common Shares into Class A Common Shares. In no event shall Class A Common Shares be convertible into Class B Common Shares.

B类普通股持有人可随时将其持有的各B类普通转换为一(1)份A类普通股。B类普通股持有人通过向公司提交书面通知说明该持有人选择将特定数量的B类普通股转换为A类普通股来行使该转换权。A类普通股在任何情况下均不得转换为B类普通股。