拐过一个弯，冬天里令人称奇的绿色沃野扑面而来，农人们没有工具，全凭双手在稻田里躬身劳作。
Turn a corner and you will happen upon the startling green of the winter harvest, of men bending over paddy fields with nothing for tools but their bare hands.
自己一个人练习击球，一练就几个小时——他成功是全凭自己刻苦努力和坚强毅力。
It was all hard graft and iron discipline: hitting a ball, alone, for hours.
由一个 Subject 代表的主体可以有多个身份和多个安全凭证，所有这些都封装在一个 Subject 中。
The principal represented by a Subject may have multiple identities and multiple security credentials, all encapsulated in the one Subject.
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