sulphur sth
及物动词，宾语是被处理的东西。
They sulphur the barrels before filling them with juice.
他们在装果汁之前先用硫处理这些桶。
用硫处理以保存
to treat something with sulphur in order to preserve it
用硫处理以保存
treat with sulphur in order to preserve
一般现在时
They sulphur the fruit to preserve it.
他们用硫处理水果以保存。
一般过去时
They sulphured the barrels before storing the wine.
他们在储存葡萄酒前用硫处理了木桶。
现在完成时
The grapes have been sulphured to prevent spoilage.
葡萄已经用硫处理过以防止变质。
规则动词，直接加 -s、-ing、-ed。
Farmers often sulphur dried fruit to keep it fresh for longer.
农民常常用硫处理水果干，以便保存更久。
用法提示：sulphur 在这里作动词，表示用硫处理以达到防腐保存的目的。
They sulphured the barrels before storing the wine in them.
他们先把木桶用硫处理过，然后再把葡萄酒存进去。
用法提示：sulphured 是 sulphur 的过去式，作动词，表示用硫处理以保存。
Sulphuring the grapes is a traditional way to preserve them.
用硫处理葡萄是一种传统的保存方法。
用法提示：Sulphuring 是 sulphur 的动名词形式，作动词，表示用硫处理以保存。
及物动词，宾语是被处理的东西。
They sulphur the barrels before filling them with juice.
他们在装果汁之前先用硫处理这些桶。
不定式表示处理的目的。
Workers sulphur the fruit to preserve its colour.
工人用硫处理水果以保持其色泽。
常用被动语态，多用于食品加工语境。
These apricots are sulphured before they are dried.
这些杏子在晒干前先用硫处理。
grammar · medium
易错句子The workers sulphur the grapes yesterday.
正确表达The workers sulphured the grapes yesterday.
描述过去发生的动作必须用过去式；sulphur 的过去式是 sulphured。原句用动词原形 sulphur 与 yesterday 矛盾，改为 sulphured 后时态才一致。
grammar · medium
易错句子The fruit is sulphur to preserve it.
正确表达The fruit is sulphured to preserve it.
被动语态中 be 动词后要用过去分词，不能用动词原形；sulphur 的过去分词是 sulphured。改为 sulphured 后句子才表示“水果被用硫处理”。
grammar · medium
易错句子They sulphur the barrels for to preserve the wine.
正确表达They sulphur the barrels to preserve the wine.
表示目的要用不定式 to do，英语中没有 for to do 这种结构，for 后也不能直接接带 to 的不定式。删去 for 后 to preserve 作目的状语，句子才合语法。
用硫处理干果（防腐并保色）
Producers sulphur dried fruit to keep it from browning.
生产商用硫处理干果，以防其变褐。
用硫处理过的杏干
Sulphured apricots keep their bright orange colour for months.
用硫处理过的杏干能保持鲜艳的橙色达数月之久。
用硫熏蒸木桶（消毒防腐）
The winemaker sulphurs the casks before filling them.
酿酒师在装桶之前用硫熏蒸木桶。
在葡萄汁中加硫（抑菌抗氧化）
They sulphur the must early to prevent oxidation.
他们早早地在葡萄汁中加硫，以防氧化。
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