twig if multi condition

{% if online == false %}
    <p>Our website is in maintenance mode. Please, come back later.</p>
{% endif %}

{% if temperature > 18 and temperature < 27 %}
    <p>It's a nice day for a walk in the park.</p>
{% endif %}

Expressions can be used in {% blocks %} and ${ expressions }.

Operator    Description
==          Does the left expression equal the right expression?
+           Convert both arguments into a number and add them.
-           Convert both arguments into a number and substract them.
*           Convert both arguments into a number and multiply them.
/           Convert both arguments into a number and divide them.
%           Convert both arguments into a number and calculate the rest of the integer division.
~           Convert both arguments into a string and concatenate them.
or          True if the left or the right expression is true.
and         True if the left and the right expression is true.
not         Negate the expression.