Unit 3
Computers
1．calculate vt.& vi.计算；考虑；计划calculate on/upon sth.指望或依靠某事物be calculated to do sth.打算或有意做某事be calculated for 适合于……
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完成句子
(1)他仔细地计算开支。He _____________________ very carefully.(2)我们不能总是指望他人帮助。We cannot always __________________________.
calculated the costs
calculate on/upon other's help
2．signal vi.& vt.发信号
n．信号
signal for 用信号传达(某信息)signal sb./sth.to do sth.向……示意做某事signal with 用……发信号a signal of/for sth.……信号
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完成句子
(1)宣告这件事是否预示以后日子越过越好了？Is this announcement ________________ bett ...