by itsef的用法和样例：
例句
- By means of radio links, the computer automatically guides both interceptor aircraft and missiles to their targets.
借助于收音机链接，计算机自动地领队到他们的目标的阻止的人飞机和导弹。 - Generally, repetition of material is constrained by the size of the linguistic unit that a person can process in an automatic or nearly automatic fashion.
通常来说，本测试中复述材料是由语言单元的长度限定的，使得人们能自动或近似于自动地处理句子。
