A course of instruction might have many different modules.

教学课程可能有许多不同的模块。

By 1918, hundreds of big companies had recognized this modern " profession" and universities were giving courses of instruction on the subject to young men and women.

到 1918 年，数百家大公司已经认可了这一现代“职业” ，大学也开始为年轻男女开设这方面的教学课程。

Long apprenticeships are altogether unnecessary. The arts, which are much superior to common trades, such as those of making clocks and watches, contain no such mystery as to require a long course of instruction.

长期的学徒期完全没有必要。艺术远优于普通行业，例如钟表制造行业，不包含需要长期指导的神秘事物。