adj.恒定的，不变的，始终如一的
n.恒定，不变，始终如一
It was his invariable custom to have one whisky before his supper.
晚饭前来杯威士忌，这是他一直以来的习惯。
Her routine was invariable.
她的日常生活总是千篇一律。
This process, however, was not invariable.
但是, 这个过程并非始终不变.
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