1、commitment
信奉;忠诚
commitment to the ideals of Bolshevism.
对布尔什维克主义理想的信奉
承诺;责任;义务
I've got a lot of commitments.
我承担了很多责任。
Work commitments forced her to uproot herself and her son from Reykjavik.
她的工作迫使她和儿子从雷克雅未克搬走。
承诺;许诺
We made a commitment to keep working together.
我们承诺继续合作。
They made a commitment to peace.
他们承诺要维护和平。
2、extend
延伸;伸展
The caves extend for some 18 kilometres.
那些洞穴深约18公里。
The main stem will extend to around 12ft, if left to develop naturally.
如果任其自然生长，主干可以长到约12英尺。
持续;延续
a playing career in first-class cricket that extended from 1894 to 1920.
从1894年延续至1920年的板球甲级比赛职业生涯
The courses are based on a weekly two-hour class, extending over a period of 25 weeks.
这些课程每周上一节课，每节两个小时，持续25周。
（设备、家具等）展开，伸展
a table which extends to accommodate extra guests.
展开后可坐更多客人的桌子
The table extends to 220cm.
桌子伸展后长220厘米。