maintain
assert oneself 坚持自己的权利，坚持己见
assessment
n. 估计，评估，估计数额
estimation
make/take an assessment of 对进行估计、评估
assumption
n. 假定，假设
supposition
n. 承当，担任
the assumption of office 就职
n. 自负，傲慢
on the assumption that 假定
on the condition that 以为条件
assurance
n. 自信，把握，胸有成竹
He answered all the questions with assurance. 他有把握地回答了所有的问题。
self-confidence
n. 承诺，担保，保证
We had his assurance that he would help us.
我们得到他愿意帮助我们的承诺。
guarantee
不动产转让
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