“隐蔽的”英文是什么？

covert

[?k?v?t]

adj.

隐蔽的; 不公开的; 秘密的

secluded

[si?klu:did]

adj.

与世隔绝的, 引退的, 隐居的

ulterior

[?l?ti?ri?]

adj.

秘而不宣的; 有意隐瞒的

She definitely had an ulterior motive in offering to help.

她主动提出帮忙, 肯定有不可告人的动机