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head
负责人；领导人
the heads of government / state
政府首脑；国家元首
She resigned as head of department.
她辞去了部门主管的职务。
the crowned heads (= the kings and queens) of Europe
欧洲各国君主
maintenance of sth
维护；保养
The school pays for heating and the maintenance of the buildings.
学校负担这些大楼的供热和维修费用。
car maintenance
汽车保养
just for once
just this once
仅此一次(与通常情况对比而言)
Just for once he arrived on time.
只有这一次他按时到了。
Can't you be nice to each other just this once?
难道你们就不能彼此客气哪怕一次？
trial
(对能力、质量、性能等的)试验,试用
The new drug is undergoing clinical trials.
这种新药正在进行临牀试验。
She agreed to employ me for a trial period.
她同意试用我一段时间。
The system was introduced on a trial basis for six month.
这个制度已引进试行一个月。
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