回答
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That jacket is highly waterproof so it completely repels the rain.
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That waterproof jacket is of high quality so it repels the rain.
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That jacket is highly waterproof and designed for mountaineering so it completely repels the rain.
「そのジャケットは高い防水性で、雨を弾く」＝ That jacket is highly waterproof so it completely repels the rain. / That waterproof jacket is of high quality so it repels the rain. / That jacket is highly waterproof and designed for mountaineering so it completely repels the rain.
ボキャブラリー
highly waterproof ＝ 高い防水性
completely ＝ 完全に
repel ＝ 弾く
rain ＝ 雨
high quality ＝ 質が高い
designed for mountaineering ＝ 登山用
イギリス 
