You learned about an expression, a conditional statement, and how words are shortened in everyday speaking.

你学习了一个表达方式，一个条件语句，以及在日常生活中单词如何缩略。

Which path you take is conditional on whether the expression is true or false -- so these expressions are called Conditional Statements.

您选择哪条路径取决于表达式是真还是假——因此这些表达式称为条件语句。