a hard nut to crack
棘手的问题
热门单词
- a kick in the teeth
- A-139
- abiuretic
- aborted document
- abrinism
- absolute electrometer
- absorbent cotton
- absorptive power
- abstain
- acceleration globulin
- accomplish
- account books
- accounting personnel
- accumulated depreciation
- accumulated damage
- accumulation principle
- accurate
- acerin
- acetosalicylic acid
- acetrizoate sodium
- acetyl benzene
