Mutual promises
[法] 相互意思表示
?? 詞語組成解析
v. 允諾
??? 情景例句
Are the bathrooms on this train clean?
火車上的衛生間干凈嗎？
Sorry, it's broken. You have to use the stairs.
對不起，它壞了，你只能走樓梯了。
'Certainly,' the girl said.
“當然可以，”那姑娘說。