lengthens
v.
（时间或空间）延长，伸长( lengthen的第三人称单数 );
例句:
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This movement lengthens your spine and tones the spinal nerves.
这一动作舒展脊椎，使脊神经更加强健。
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In summer, the daylight hour lengthens.
夏天, 白天的时间长.
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Summer lengthens ( out ) into autumn .
夏 去秋 来.
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The earth can support more people when global warming increases rainfall and lengthens the growing season.
来自SA
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In comoving coordinates, energy is not conserved; the wavelength of a photon lengthens, so it loses energy.
来自SA
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She is making what appears to be a shawl, and it lengthens millimeter by millimeter with each pass.
来自VOA