as clear as a whistle; clear footprints in the snow; the letter brought back a clear image of his grandfather; a spire clean-cut against the sky; a clear-cut pattern.

• 像汽笛一样清晰；雪上清晰的脚印；这封信使他清晰的回想起爷爷的样子；天空下轮廓鲜明的塔尖；轮廓鲜明的图案。