thickening
['θɪkənɪŋ]
n.
使变厚，增厚过程;
v.
（使）变厚（或粗、浓、密），使更厚（或更密、更浓、更粗）( thicken的现在分词 );
使（话等）不清晰，使模糊;
使（情节等）复杂;
变得不清晰，变得模糊;
例句:
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Later, skin thickening makes joints tight and uncomfortable.
来自BBC
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The whole city was muffled by this fast - thickening mantle.
整个城市都被这场迅速加厚的大雪包裹了起来.
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Thickening is the usual first step in sludge disposal processing.
污泥处置过程中,浓缩通常是第一道工序.
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Already , at four o'clock, the sombre hue of night was thickening the air.
4点钟时, 空中已是一片夜色朦胧.
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This thickening, discolouration and disfigurement are clearly visible.
来自BBC
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Palm roots are fibrous and have no secondary thickening.
来自SA