English → Chinese
vain
/BrE veɪn 
, AmE veɪn /
adjective
1 (conceited) 自负的;
to be vain about sth; 为某事自负
2 usu attrib (futile) 徒劳的 ‹promise, attempt›; 枉费心机的 ‹display, boast›;
to be (all) in vain （完全）是白费劲;
in the vain hope that … 徒然希望…;
in a vain attempt or effort to do sth 徒劳地做某事;
take sb's name in vain 亵渎某人的名字