Bonjour
C'est la fille de ma mère mais ce n'est pas moi, qui est-ce ?
<em>She is my mother daughter but, she's not me ? Who is she ?</em>
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<em>Ma sœur </em><em> = my sister</em>
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<em>☺☺☺</em>
<span>Submarines are equipped with water tanks called ballast tanks that fill up to submerge the vessel. Emptying the tanks and filling them with air causes the submarine to surface.</span>
Look at your speedometer for say, a couple of seconds. Depends on whether or not you are moving on average at a constant speed (speedo won't change much) or whether you're in a polluting traffic jam/queue in which case the speedo will go up and down like a yo yo. to determine the speed, you'd probably need to plot the speed on the speedo against the times at which the speedo speeds were read from the speedo.
