This is as useful as screen door on a submarine.
这毫无用处。
疯狂英语 900 句
谈成语
📚 句中词汇解析
从本句中提取的重要词汇
adj. 有用的，有益的，有帮助的;令人满意的;
💡 use用+ful可…的” →有用的
"The memory expansion cards are useful adjuncts to the computer."
内存扩充卡是计算机很有用的附件。
近义：helpful, assistive, available, profitable, purposive, serviceable
反义：idle, inane, ineffective, insignificant, lousy, needless
n. 潜艇;海底生物;
adj. 水下的，海底的;
vt. 用潜艇攻击;
vi. 驾驶潜艇;划入底下;
💡 sub在下面+marine海洋的→在海下面→海底的；潜水艇
"Within a short time, everything on the submarine was buttoned up."
不一会儿, 潜水艇内所有的东西都扣紧了.
近义：sub, subaquatic, undersea, underwater, hero
n. 屏幕;银幕;屏风;
vt. 掩藏;庇护;检查;放映;
"He nodded absently, his attention absorbed by the screen."
他专心注视着屏幕，只是心不在焉地点了点头。
近义：hide, mask, obscure, occlude, occult, secrete
n. 门，户;出入口;一家[户];通道;
💡 盗（谐音）： 门破了，东西被盗了
"I'll leave the door ajar."
我让门半开着。
近义：doorway, entrance, entranceway, entryway