Sentence:  However, for pins on the bowler's right, such as the 3, 6, 9, or 10, move more toward the center of the foul line if you bowl a straight ball or slightly to the left of the center of the foul line if you bowl a <WSD>hook</WSD>. 
Meaning of the word marked with <WSD> tags:  A ball that is rolled in a curved line.