How Microbes Help Create Renewable Biofuels
B2 English listening practice · American English · Curated for upper-intermediate learners
About this clip
A 3:52 video in English at B2 level, suitable for upper-intermediate learners. The speech is at a natural pace around 173 words per minute, rated 4.3/5, medium listening difficulty by Reelang’s algorithm.
What this clip covers:
- ▸Science - Discoveries, experiments, and how the world works.
- ▸Nature & Environment - The natural world, climate, and sustainability.
From TED-Ed↗ on YouTube.Watch original
Vocabulary frequency
How common is the vocabulary in this B2 English listening practice listening practice?
83.7%
of words are in the top 2,000 most common English words
Based on this reel’s transcript, most of the vocabulary is high-frequency, everyday English.
General English frequency
77.3%
Top 1,000
83.7%
Top 2,000
93%
Top 5,000
Spoken English frequency
81.2%
Top 1,000
91.3%
Top 2,000
100%
Top 5,000
👄 Conversational vocabulary
This reel’s words appear more often in subtitle-based spoken-English data than in general usage, so it may feel closer to everyday conversation.
Words above this video’s level
Quick glosses for vocabulary that goes beyond this video’s B2 level.
cellulose
18×
Rare / outside top 5,000
plant sugar compound
cellulase
3×
Rare / outside top 5,000
enzyme breaking down cellulose
microbe
3×
Rare / outside top 5,000
tiny living organism
biofuels
2×
Rare / outside top 5,000
fuels from biological materials
limited supply part of the quandary
1×
problem of scarce resources in energy supply
Source: wordfreq 3.1.1 (general) · SUBTLEX-US 2012 (spoken). Buckets approximate; exact ranks not stored.
Explore American English Comprehensible Input on Reelang
Open English hubBy skill level
By accent / dialect