strain

【原文】
Booming U.S. oil production is straining America's pipelines, and automated probes used by Exxon and other companies are failing to detect tiny fissures that can result in massive spills.

【単語の意味（日本語）】
（体など）を痛める；～をぴんと張る

【その他の単語】
detect ～を見つける
fissure 深い裂け目