Data from the high-resolution flight images allowed the researchers to create a near-perfect mathematical model of how the flexible, twisting wings propel the insect through the air.
As she spoke thus, she was twisting the bill about in her hands with an embarrassed air, and making creases in it with her nails.
她一面这样说，一面带着为难的样子，把那张账单拿在手里翻来复去，并用指甲掐着它，折了又折。
3
As they flew over the dark, twisting lane down which they had walked earlier, Harry heard, over the whistling of the night air in his ears, Dumbledore muttering in some strange language again.