1.invation

n.

[definition]:入侵、侵略

[root&affix]:in+vas（走）+ion（名詞后綴）--走進(jìn)來--入侵、侵略

[example]:the freedom from foreign invasion?（不受外來侵略）enables a country to develop its natural resources steadily.

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2.nevertheless

ad.conj.

[definition]:仍然、然而；然而、

[example]:he was tired,nevertheless he kept on working.

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3.attendance

n.

[definition]:到場(chǎng)、出席；出勤；伺候、照料

[example]:take attendance點(diǎn)名;attendance record考勤記錄

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4.optional

a.

[definition]:可選擇的、非強(qiáng)制的、隨意的

[example]:an optional course選修課

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5.enable

vt.

[definition]:使能夠、使成為可能

[example]:enable sb to do sth.the bank service enables you to withdraw cash from your account at any time.

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回顧：1.invation 2.neverthless 3.attendance 4.optional 5.enable