adj. 滑的; 滑得抓不住(或站不稳、难以行走)的; 油滑的; 滑头滑脑的; 靠不住的; 难以应对的; 棘手的;
There was a natural rock bridge in Mountain Chi Cheng. The bridge was only one foot in width, and was covered with smooth and slippery mosses1. On both sides there were steep cliffs, and it was really dangerous.
赤城山上有一座天然的、完全由岩石架成的梁，桥面只有一尺宽，上面长满了又软又滑的苔藓，两旁是峭壁悬崖，极其危险。
the/a slippery slope
使人滑向深渊的斜坡；危险的境地
a course of action that is difficult to stop once it has begun, and can lead to serious problems or disaster
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