?像水一样不稳定
... above water：脱离困境的 as unstable as water：像水一样不稳定，变化无常 as weak as water：身体非常虚弱；意志薄弱；性格懦弱 ...
?象水一样不稳定
as unstable as water 象水一样不稳定, 变化无常..
?反复无常
... as ugly as a scarecrow丑极了 as unstable as water反复无常 as warm as toast暖烘烘的，热得满面红光的 ...
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。