势必 (be bound to / inevitably)

A strong forecast needs supporting reasons

• A report predicts that a closure will necessarily affect travel.
• to close封闭fēng bìthis这zhèstrip条tiáoroad道路dào lù，be bound to势必shì bìinfluence影响yǐng xiǎngto go out somewhere…出行chū xíng。 — The writer presents the effect as unavoidable.

Locate the pattern in real examples

• be bound to势必shì bì (be bound to / inevitably): this way / so这样zhè yàngto make做zuòbe bound to势必shì bìto give rise to引起yǐn qǐto misunderstand误会wù huì。; long term长期cháng qīto stay up late or all night熬夜áo yèbe bound to势必shì bìinfluence影响yǐng xiǎnghealth健康jiàn kāng。
• Read the whole clause before choosing a translation. The examples show the pattern in use; the context below determines what the speaker claims.

Follow the speaker

not不bùchange改变gǎi biàn，be bound to势必shì bìfall behind落后luò hòu。

• In the opening situation: to close封闭fēng bìthis这zhèstrip条tiáoroad道路dào lù，be bound to势必shì bìinfluence影响yǐng xiǎngto go out somewhere…出行chū xíng。
• The writer presents the effect as unavoidable.

Check the limit of the explanation

• be bound to势必shì bì is stronger than maybe / possible可能kě néng.
• It expresses confidence in a prediction, not independent proof. If evidence only suggests a possibility, choose maybe / possible可能kě nénginfluence影响yǐng xiǎng instead.

Repair the form before interpreting it

• The form power势shì(completed / change)了lecertainly必bìinfluence影响yǐng xiǎngto go out somewhere…出行chū xíng needs repair here. Write be bound to势必shì bìinfluence影响yǐng xiǎngto go out somewhere…出行chū xíng instead; keep the word or frame in its demonstrated order.
• Form and meaning are separate checks. After the repair, explain the sentence in its situation rather than treating a familiar translation as a universal rule.

Keep the distinction

Read the full reference: HSK 6 grammar — Sentence patterns.