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难度:★★★☆☆词数:345建议阅读时间:7分钟Noise from ships stresses whales nearby,researchers have shown.Ships’propellers(螺旋桨)send out sound in the same frequency range that some whalesuse for communicating,and previous studies have shown the whales change their
Difficulty: ★★★ ☆☆ Number of words: 345 Suggested reading time: 7 minutes Noise from vessels stresses whales nearby, researchers have shown. Seaspropellers (propellers) send out sound in the same frequency range that some whalesuse for communicating, previous studies have shown the whales change their