1.mutual

adj.

[definition]:相互的、共同的

[example]:mutual understanding,mutual benefit

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2.hectare

n.

[definition]:公頃

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3.density

n.

[definition]:密集、濃度、密度

[example]:population density

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4.companion

n.

[definition]:共事者、同伴

[example]:chinese?companion

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5.rig

vt&n

[definition]:操縱、壟斷&船帆的裝置

[root&affix]:聯(lián)想記憶：挖（dig）個洞把器械（rig）藏起來

[example]:the defeated candidate claimed that the election was rigged.

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回顧：1.mutual 2.hectare 3.density 4.companion 5.rig