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helium [ˈhiːlıəm] 名词

hell [hel] 名词

3. hell [用于加强语气或咒骂]:

helm [helm] 名词

I . help [help] 动词 trans

II . help [help] 动词 不及物动词

III . help [help] 名词

IV . help [help] 感叹词

helmet [ˈhelmıt] 名词

heliport [ˈhelıpɔːt] 名词

helpline [ˈhelplaın] 名词

I . prefix [ˈpriːfıks] 名词 语言

II . prefix [ˈpriːfıks, priːˈfıks] 动词 trans

单语范例(未经PONS编辑处理)

英语
The rough secondary-structure content of a biopolymer (e.g., this protein is 40% -helix and 20% -sheet.) can often be estimated spectroscopically.
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In essence, leaves form a helix pattern centered around the stem, either clockwise or counterclockwise, with (depending upon the species) the same angle of divergence.
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The catalytic domain consists of a double-stranded -helix core that is stabilized by three -helices packed along the major -sheet.
en.wikipedia.org
When all the base pairs in a DNA double helix melt, the strands separate and exist in solution as two entirely independent molecules.
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An upward helix follows the downward turn and is followed by a right corkscrew.
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Furthermore, the interaction between protein side-chains of the -helix with the DNA bases in the major groove allows for the DNA-sequence-specific recognition.
en.wikipedia.org
In apoaequorin, each pocket is bordered by sequences that create alpha helices giving rise to the helix-loop-helix conformation.
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A common arrangement uses a series of coils arranged in a helix around the toroid, creating an electrical analog of the mechanical layout.
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Occasionally, the knurled pattern is a series of straight ridges or a helix of straight ridges rather than the more-usual criss-cross pattern.
en.wikipedia.org
If the wave is frozen in time, the electric field vector of the wave describes a helix along the direction of propagation.
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