1) The anxiety of strolling on ice-dangerous, apprehensive
践冰之虑
2) Apprehension of Danger
危险之虑
3) the law of practice
实践之法
4) To tread on one's heels
践人之踵
补充资料:践冰
1.犹履冰。比喻处于险境。语本《诗.小雅.小旻》:"如临深渊,如履薄冰。"
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