as if [as though] on the brink of a deep gulf [abyss]; act with extreme caution; feel like standing upon the edge of an abyss
Example Sentences:
1.
135 between master and disciples on thin ice 135师徒之间如临深渊如履薄冰
2.
That meant they had to finish all the arrangements and decorating within two hours . all the working staff members prepared gingerly , feeling the pressure of this task 六点来宾开始入场，而四点才能进去布置，也就是在二个小时之内，要完成所有的布置工作，所有工作人员莫不战战兢兢，如临深渊，压力非常大。
3.
I was stunned for a while , but then immediately realized that even if i struggled hard to surpass myself , i needed to practice constant vigilance , as if treading on thin ice . i could not be complacent or relax my alertness 当时我愣了一会儿，随即提醒自己：即使辛苦用功，跨越了自我，还是要戒慎小心，时时如临深渊如履薄冰，不能稍有得意放纵之心。
