To be of small ability but burdened with a heavy responsibility; to be unequal to a demanding task; to be unable to cope with the duties.
他虽然很有热情，但毕竟经验不足，面对这个大项目，真是力小任重，感到有些吃力。
Although he is very enthusiastic, he ultimately lacks experience; facing this large project, he truly feels that his abilities are insufficient for the heavy responsibility and finds it somewhat challenging.
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