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be + chewing + sth
chewing 是 chew 的现在分词，与 be 动词构成进行时态。
The baby is chewing a toy.
宝宝正在嚼一个玩具。
咀嚼
先理解核心含义，再看它在真实句子里的用法。
咀嚼
the action of biting and grinding food in the mouth so that it becomes soft enough to swallow
The baby is chewing a toy.
宝宝正在嚼一个玩具。
咀嚼某物的行为；咀嚼。
The act by which something is chewed on; mastication.
食用恰特草(的汁液)。
The consumption of (the juice from) the khat plant.
将散叶烟草置于脸颊附近咀嚼,以摄取烟草汁液。
The consumption of loose leaf tobacco juice from tobacco plants by chewing leaves near the cheek.
Slow chewing helps you digest your food better.
细嚼慢咽有助于你更好地消化食物。
The doctor told him that his loud chewing at the dinner table was rude.
医生告诉他在餐桌上大声咀嚼很不礼貌。
She tried to focus on the taste of the apple instead of the sound of her own chewing.
她试着专注于苹果的味道，而不是自己咀嚼的声音。
chewing 是 chew 的现在分词，与 be 动词构成进行时态。
The baby is chewing a toy.
宝宝正在嚼一个玩具。
chewing 在此为名词，常与 of 连用，表示“对……的咀嚼”。
The chewing of food is the first step in digestion.
咀嚼食物是消化的第一步。
by + 动名词表示方式、手段；chewing 是动名词。
You can improve digestion by chewing slowly.
你可以通过细嚼慢咽来改善消化。
Not this
I bought some chewing gums.
Use this
I bought some chewing gum.
chewing gum（口香糖）作为物质名词不可数，不能加-s表示多块；应说 a piece of chewing gum 或直接说 some chewing gum。
Not this
I chewing my food slowly.
Use this
I am chewing my food slowly.
现在进行时结构是 be + 动词-ing，不能省略 be 动词，所以这里需要加 am。
Not this
He is chewing the meat hardly.
Use this
He is chewing the meat hard.
hardly 意为“几乎不”，不能用来表示“用力地”；修饰动作“用力嚼”应使用副词 hard。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
口香糖
She offered me a piece of chewing gum.
她递给我一块口香糖。
嚼烟
Chewing tobacco can harm your health.
嚼烟会危害你的健康。
充分咀嚼食物
Chewing food thoroughly helps you digest better.
充分咀嚼食物有助于你更好地消化。
张着嘴咀嚼
Chewing with your mouth open is bad manners.
张着嘴咀嚼是不礼貌的行为。
大声咀嚼
His noisy chewing irritated everyone at the table.
他大声咀嚼的声音惹恼了桌上的每个人。
闲聊，闲扯
We spent the evening chewing the fat over a few beers.
我们晚上喝了几杯啤酒，闲聊了一晚。
深思，反复琢磨
He sat quietly, chewing the cud over the offer.
他静静地坐着，反复琢磨那个提议。
表演过火，夸张做作
The actor was accused of chewing the scenery in every scene.
这位演员被指责在每场戏中都表演过火。
Use chewing naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象牛在嚼草，嘴巴不停做“chew”的动作，chewing 就是咀嚼。
语域：neutral 常见场景：日常对话、进餐场合、医疗/生理描述 该词通常指咀嚼的动作，语气中性；多用于日常对话和进餐场合，也可见于医学或生理学相关描述。
Chewing /ˈtʃuːɪŋ/ rhymes with doing, viewing, suing, brewing, and screwing. Brewing and screwing also share the -ewing spelling with chewing. Beware sewing: it looks like -ewing but is pronounced /ˈsoʊɪŋ/, so it does not rhyme.
Dictionary facts from ECDICT, WIKTIONARY.