be unsparing in one's efforts
不遗余力
,不留情;;,残忍;;;
;
;
;;
伤心,痛苦;入胜;be unsparing in one's efforts
不遗余力
an unsparing superior officer; unsparing criticism.
一名苛严
上级军官；不留情面批评
he is unsparing in his criticism of the arms trade.
他对军火交易进行无情批评。
she had won her mother's unsparing approval.
她赢得母亲慷慨赞许。
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