
The translated text window is also scrollable and selectable. Once
the text you want to inspect is shown, stop the translation by right
clicking to bring up the context menu. While the context menu is up,
move your mouse to the translation area, and select text or scroll
with mousewheel.

Obviously, you can also copy the text to the clipboard and
do a Google Translation with the
context menu :)
The search window can also be used as a scratchpad for copy/paste
exchange with the translation window: