The operation is still considered risky and experimental.
experimental teaching materials
results obtained under the new experimental conditions
Experimental evidence supports this conclusion.
The treatment has been used experimentally, but it is too early to tell whether it works.
英语词典包含67175条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。